diff --git a/src/StreetNameRegistry.Api.Legacy/StreetName/Query/StreetNameListQueryV2.cs b/src/StreetNameRegistry.Api.Legacy/StreetName/Query/StreetNameListQueryV2.cs
index fcb98bba8..11e0b76ba 100644
--- a/src/StreetNameRegistry.Api.Legacy/StreetName/Query/StreetNameListQueryV2.cs
+++ b/src/StreetNameRegistry.Api.Legacy/StreetName/Query/StreetNameListQueryV2.cs
@@ -68,6 +68,9 @@ protected override IQueryable<StreetNameListItemV2> Filter(FilteringHeader<Stree
             if (!string.IsNullOrEmpty(filtering.Filter.NameGerman))
                 streetNames = streetNames.Where(s => s.NameGerman.Contains(filtering.Filter.NameGerman));
 
+            if (filtering.Filter.IsInFlemishRegion.HasValue)
+                streetNames = streetNames.Where(x => x.IsInFlemishRegion);
+
             var filterMunicipalityName = filtering.Filter.MunicipalityName.RemoveDiacritics();
             if (!string.IsNullOrEmpty(filtering.Filter.MunicipalityName))
             {
@@ -156,5 +159,7 @@ public sealed class StreetNameFilter
         public string Status { get; set; } = string.Empty;
         public string? NisCode { get; set; } = string.Empty;
         public string? PostalCode { get; set; } = string.Empty;
+
+        public bool? IsInFlemishRegion { get; set; } = null;
     }
 }
diff --git a/src/StreetNameRegistry.Api.Oslo/StreetName/Query/StreetNameListOsloQueryV2.cs b/src/StreetNameRegistry.Api.Oslo/StreetName/Query/StreetNameListOsloQueryV2.cs
index 2270e9845..b4df9dcb5 100644
--- a/src/StreetNameRegistry.Api.Oslo/StreetName/Query/StreetNameListOsloQueryV2.cs
+++ b/src/StreetNameRegistry.Api.Oslo/StreetName/Query/StreetNameListOsloQueryV2.cs
@@ -78,6 +78,11 @@ protected override IQueryable<StreetNameListItemV2> Filter(FilteringHeader<Stree
                 streetNames = streetNames.Where(s => s.NameGerman.Contains(filtering.Filter.NameGerman));
             }
 
+            if (filtering.Filter.IsInFlemishRegion.HasValue)
+            {
+                streetNames = streetNames.Where(x => x.IsInFlemishRegion);
+            }
+
             var filterMunicipalityName = filtering.Filter.MunicipalityName.RemoveDiacritics();
             if (!string.IsNullOrEmpty(filtering.Filter.MunicipalityName))
             {
@@ -165,5 +170,6 @@ public class StreetNameFilter
         public string Status { get; set; }
         public string? NisCode { get; set; }
         public string? PostalCode { get; set; }
+        public bool? IsInFlemishRegion { get; set; } = null;
     }
 }
diff --git a/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.Designer.cs b/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.Designer.cs
new file mode 100644
index 000000000..ec1190e26
--- /dev/null
+++ b/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.Designer.cs
@@ -0,0 +1,655 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using StreetNameRegistry.Projections.Legacy;
+
+#nullable disable
+
+namespace StreetNameRegistry.Projections.Legacy.Migrations
+{
+    [DbContext(typeof(LegacyContext))]
+    [Migration("20230929115231_AddIsInFlemishRegion_List")]
+    partial class AddIsInFlemishRegion_List
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.3")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder, 1L, 1);
+
+            modelBuilder.Entity("Be.Vlaanderen.Basisregisters.ProjectionHandling.Runner.ProjectionStates.ProjectionStateItem", b =>
+                {
+                    b.Property<string>("Name")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("DesiredState")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<DateTimeOffset?>("DesiredStateChangedAt")
+                        .HasColumnType("datetimeoffset");
+
+                    b.Property<string>("ErrorMessage")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<long>("Position")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Name");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("Name"));
+
+                    b.ToTable("ProjectionStates", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameDetail.StreetNameDetail", b =>
+                {
+                    b.Property<Guid>("StreetNameId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<bool>("Complete")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("HomonymAdditionDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NisCode")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<int?>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("StreetNameId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("StreetNameId"), false);
+
+                    b.HasIndex("PersistentLocalId")
+                        .IsUnique()
+                        .HasDatabaseName("IX_StreetNameDetails_PersistentLocalId_1")
+                        .HasFilter("([PersistentLocalId] IS NOT NULL)");
+
+                    SqlServerIndexBuilderExtensions.IsClustered(b.HasIndex("PersistentLocalId"), false);
+
+                    b.HasIndex("Removed");
+
+                    b.ToTable("StreetNameDetails", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameDetailV2.StreetNameDetailV2", b =>
+                {
+                    b.Property<int>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("HomonymAdditionDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("LastEventHash")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<Guid>("MunicipalityId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NisCode")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("PersistentLocalId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("PersistentLocalId"));
+
+                    b.HasIndex("MunicipalityId");
+
+                    b.HasIndex("Removed");
+
+                    b.ToTable("StreetNameDetailsV2", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameList.StreetNameListItem", b =>
+                {
+                    b.Property<Guid>("StreetNameId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<bool>("Complete")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("HomonymAdditionDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameDutchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameEnglishSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameFrenchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameGermanSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NisCode")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<int?>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<int?>("PrimaryLanguage")
+                        .HasColumnType("int");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("StreetNameId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("StreetNameId"), false);
+
+                    b.HasIndex("NameDutchSearch");
+
+                    b.HasIndex("NameEnglishSearch");
+
+                    b.HasIndex("NameFrenchSearch");
+
+                    b.HasIndex("NameGermanSearch");
+
+                    b.HasIndex("NisCode");
+
+                    b.HasIndex("PersistentLocalId")
+                        .IsUnique()
+                        .HasDatabaseName("IX_StreetNameList_PersistentLocalId_1")
+                        .HasFilter("([PersistentLocalId] IS NOT NULL)");
+
+                    SqlServerIndexBuilderExtensions.IsClustered(b.HasIndex("PersistentLocalId"), false);
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("Complete", "Removed");
+
+                    b.HasIndex("Complete", "Removed", "PersistentLocalId");
+
+                    b.ToTable("StreetNameList", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameList.StreetNameListViewCount", b =>
+                {
+                    b.Property<long>("Count")
+                        .HasColumnType("bigint");
+
+                    b.ToView("vw_StreetNameListIds", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameListV2.StreetNameListItemV2", b =>
+                {
+                    b.Property<int>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("HomonymAdditionDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<bool>("IsInFlemishRegion")
+                        .HasColumnType("bit");
+
+                    b.Property<Guid>("MunicipalityId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameDutchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameEnglishSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameFrenchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameGermanSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NisCode")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<int?>("PrimaryLanguage")
+                        .HasColumnType("int");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("PersistentLocalId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("PersistentLocalId"));
+
+                    b.HasIndex("IsInFlemishRegion");
+
+                    b.HasIndex("MunicipalityId");
+
+                    b.HasIndex("NameDutchSearch");
+
+                    b.HasIndex("NameEnglishSearch");
+
+                    b.HasIndex("NameFrenchSearch");
+
+                    b.HasIndex("NameGermanSearch");
+
+                    b.HasIndex("NisCode");
+
+                    b.HasIndex("Removed");
+
+                    b.HasIndex("Status");
+
+                    b.ToTable("StreetNameListV2", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameListV2.StreetNameListMunicipality", b =>
+                {
+                    b.Property<Guid>("MunicipalityId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("NisCode")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<int?>("PrimaryLanguage")
+                        .HasColumnType("int");
+
+                    b.Property<int?>("SecondaryLanguage")
+                        .HasColumnType("int");
+
+                    b.HasKey("MunicipalityId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("MunicipalityId"));
+
+                    b.ToTable("StreetNameListMunicipality", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameName.StreetNameName", b =>
+                {
+                    b.Property<Guid>("StreetNameId")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<bool>("Complete")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsFlemishRegion")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameDutchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglishSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrenchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGermanSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NisCode")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<int>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("StreetNameId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("StreetNameId"), false);
+
+                    b.HasIndex("NameDutch");
+
+                    b.HasIndex("NameDutchSearch");
+
+                    b.HasIndex("NameEnglish");
+
+                    b.HasIndex("NameEnglishSearch");
+
+                    b.HasIndex("NameFrench");
+
+                    b.HasIndex("NameFrenchSearch");
+
+                    b.HasIndex("NameGerman");
+
+                    b.HasIndex("NameGermanSearch");
+
+                    b.HasIndex("NisCode");
+
+                    b.HasIndex("PersistentLocalId");
+
+                    SqlServerIndexBuilderExtensions.IsClustered(b.HasIndex("PersistentLocalId"));
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("VersionTimestampAsDateTimeOffset");
+
+                    b.HasIndex("Removed", "IsFlemishRegion", "Complete");
+
+                    b.ToTable("StreetNameName", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameNameV2.StreetNameNameV2", b =>
+                {
+                    b.Property<int>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<bool>("IsFlemishRegion")
+                        .HasColumnType("bit");
+
+                    b.Property<Guid>("MunicipalityId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameDutchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameEnglishSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameFrenchSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NameGermanSearch")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("NisCode")
+                        .IsRequired()
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<bool>("Removed")
+                        .HasColumnType("bit");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<DateTimeOffset>("VersionTimestampAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("VersionTimestamp");
+
+                    b.HasKey("PersistentLocalId");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("PersistentLocalId"));
+
+                    b.HasIndex("MunicipalityId");
+
+                    b.HasIndex("NameDutch");
+
+                    b.HasIndex("NameDutchSearch");
+
+                    b.HasIndex("NameEnglish");
+
+                    b.HasIndex("NameEnglishSearch");
+
+                    b.HasIndex("NameFrench");
+
+                    b.HasIndex("NameFrenchSearch");
+
+                    b.HasIndex("NameGerman");
+
+                    b.HasIndex("NameGermanSearch");
+
+                    b.HasIndex("NisCode");
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("VersionTimestampAsDateTimeOffset");
+
+                    b.HasIndex("Removed", "IsFlemishRegion");
+
+                    b.ToTable("StreetNameNameV2", "StreetNameRegistryLegacy");
+                });
+
+            modelBuilder.Entity("StreetNameRegistry.Projections.Legacy.StreetNameSyndication.StreetNameSyndicationItem", b =>
+                {
+                    b.Property<long>("Position")
+                        .HasColumnType("bigint");
+
+                    b.Property<int?>("Application")
+                        .HasColumnType("int");
+
+                    b.Property<string>("ChangeType")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("EventDataAsXml")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("HomonymAdditionGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<bool>("IsComplete")
+                        .HasColumnType("bit");
+
+                    b.Property<DateTimeOffset>("LastChangedOnAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("LastChangedOn");
+
+                    b.Property<int?>("Modification")
+                        .HasColumnType("int");
+
+                    b.Property<Guid?>("MunicipalityId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<string>("NameDutch")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameEnglish")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameFrench")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NameGerman")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("NisCode")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<string>("Operator")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<int?>("Organisation")
+                        .HasColumnType("int");
+
+                    b.Property<int?>("PersistentLocalId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Reason")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<DateTimeOffset>("RecordCreatedAtAsDateTimeOffset")
+                        .HasColumnType("datetimeoffset")
+                        .HasColumnName("RecordCreatedAt");
+
+                    b.Property<int?>("Status")
+                        .HasColumnType("int");
+
+                    b.Property<Guid?>("StreetNameId")
+                        .HasColumnType("uniqueidentifier");
+
+                    b.Property<DateTimeOffset>("SyndicationItemCreatedAt")
+                        .HasColumnType("datetimeoffset");
+
+                    b.HasKey("Position");
+
+                    SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("Position"));
+
+                    b.HasIndex("PersistentLocalId");
+
+                    b.HasIndex("Position")
+                        .HasDatabaseName("CI_StreetNameSyndication_Position")
+                        .HasAnnotation("SqlServer:ColumnStoreIndex", "");
+
+                    b.HasIndex("StreetNameId");
+
+                    b.ToTable("StreetNameSyndication", "StreetNameRegistryLegacy");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.cs b/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.cs
new file mode 100644
index 000000000..95c60e4f3
--- /dev/null
+++ b/src/StreetNameRegistry.Projections.Legacy/Migrations/20230929115231_AddIsInFlemishRegion_List.cs
@@ -0,0 +1,42 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace StreetNameRegistry.Projections.Legacy.Migrations
+{
+    public partial class AddIsInFlemishRegion_List : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<bool>(
+                name: "IsInFlemishRegion",
+                schema: "StreetNameRegistryLegacy",
+                table: "StreetNameListV2",
+                type: "bit",
+                nullable: false,
+                defaultValue: false);
+
+            migrationBuilder.Sql(
+                "UPDATE StreetNameRegistryLegacy.StreetNameListV2 SET IsInFlemishRegion = 1 WHERE NisCode LIKE '1%' OR NisCode LIKE '3%' OR NisCode LIKE '4%' OR NisCode LIKE '7%' OR NisCode LIKE '23%' OR NisCode LIKE '24%'");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StreetNameListV2_IsInFlemishRegion",
+                schema: "StreetNameRegistryLegacy",
+                table: "StreetNameListV2",
+                column: "IsInFlemishRegion");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_StreetNameListV2_IsInFlemishRegion",
+                schema: "StreetNameRegistryLegacy",
+                table: "StreetNameListV2");
+
+            migrationBuilder.DropColumn(
+                name: "IsInFlemishRegion",
+                schema: "StreetNameRegistryLegacy",
+                table: "StreetNameListV2");
+        }
+    }
+}
diff --git a/src/StreetNameRegistry.Projections.Legacy/Migrations/LegacyContextModelSnapshot.cs b/src/StreetNameRegistry.Projections.Legacy/Migrations/LegacyContextModelSnapshot.cs
index 2e0d2bb9e..52d4f188d 100644
--- a/src/StreetNameRegistry.Projections.Legacy/Migrations/LegacyContextModelSnapshot.cs
+++ b/src/StreetNameRegistry.Projections.Legacy/Migrations/LegacyContextModelSnapshot.cs
@@ -290,6 +290,9 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Property<string>("HomonymAdditionGerman")
                         .HasColumnType("nvarchar(max)");
 
+                    b.Property<bool>("IsInFlemishRegion")
+                        .HasColumnType("bit");
+
                     b.Property<Guid>("MunicipalityId")
                         .HasColumnType("uniqueidentifier");
 
@@ -338,6 +341,8 @@ protected override void BuildModel(ModelBuilder modelBuilder)
 
                     SqlServerKeyBuilderExtensions.IsClustered(b.HasKey("PersistentLocalId"));
 
+                    b.HasIndex("IsInFlemishRegion");
+
                     b.HasIndex("MunicipalityId");
 
                     b.HasIndex("NameDutchSearch");
diff --git a/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListProjectionsV2.cs b/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListProjectionsV2.cs
index 9bbe98a18..829d66c6e 100755
--- a/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListProjectionsV2.cs
+++ b/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListProjectionsV2.cs
@@ -9,7 +9,6 @@ namespace StreetNameRegistry.Projections.Legacy.StreetNameListV2
     using Municipality;
     using Municipality.Events;
     using NodaTime;
-    using StreetNameName = Municipality.StreetNameName;
 
     [ConnectedProjectionName("API endpoint lijst straatnamen")]
     [ConnectedProjectionDescription("Projectie die de straatnamen data voor de straatnamen lijst voorziet.")]
@@ -28,6 +27,7 @@ await context.StreetNameListMunicipality.FindAsync(message.Message.MunicipalityI
                     PersistentLocalId = message.Message.PersistentLocalId,
                     MunicipalityId = message.Message.MunicipalityId,
                     NisCode = message.Message.NisCode,
+                    IsInFlemishRegion = RegionFilter.IsFlemishRegion(message.Message.NisCode),
                     VersionTimestamp = message.Message.Provenance.Timestamp,
                     Removed = message.Message.IsRemoved,
                     PrimaryLanguage = municipality.PrimaryLanguage,
@@ -53,6 +53,7 @@ await context.StreetNameListMunicipality.FindAsync(message.Message.MunicipalityI
                     PersistentLocalId = message.Message.PersistentLocalId,
                     MunicipalityId = message.Message.MunicipalityId,
                     NisCode = message.Message.NisCode,
+                    IsInFlemishRegion = RegionFilter.IsFlemishRegion(message.Message.NisCode),
                     VersionTimestamp = message.Message.Provenance.Timestamp,
                     Removed = false,
                     PrimaryLanguage = municipality.PrimaryLanguage,
@@ -260,9 +261,11 @@ await context.StreetNameListMunicipality.FindAsync(message.Message.MunicipalityI
                     .Where(s => s.MunicipalityId == message.Message.MunicipalityId)
                     .Union(context.StreetNameListV2.Where(s => s.MunicipalityId == message.Message.MunicipalityId));
 
+                var streetNameIsInFlemishRegion = RegionFilter.IsFlemishRegion(message.Message.NisCode);
                 foreach (var streetName in streetNames)
                 {
                     streetName.NisCode = message.Message.NisCode;
+                    streetName.IsInFlemishRegion = streetNameIsInFlemishRegion;
                 }
             });
 
diff --git a/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListV2.cs b/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListV2.cs
index 7abf13036..3f0cb0c16 100755
--- a/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListV2.cs
+++ b/src/StreetNameRegistry.Projections.Legacy/StreetNameListV2/StreetNameListV2.cs
@@ -37,6 +37,8 @@ public sealed class StreetNameListItemV2
 
         public string NisCode { get; set; }
 
+        public bool IsInFlemishRegion { get; set; }
+
         private DateTimeOffset VersionTimestampAsDateTimeOffset { get; set; }
 
         public Instant VersionTimestamp
@@ -88,6 +90,7 @@ public void Configure(EntityTypeBuilder<StreetNameListItemV2> builder)
             builder.Property(x => x.PrimaryLanguage);
 
             builder.Property(x => x.NisCode);
+            builder.Property(x => x.IsInFlemishRegion);
 
             builder.HasIndex(x => x.NisCode);
             builder.HasIndex(x => x.Status);
@@ -99,7 +102,7 @@ public void Configure(EntityTypeBuilder<StreetNameListItemV2> builder)
 
             builder.HasIndex(x => x.MunicipalityId);
             builder.HasIndex(x => x.Removed);
-
+            builder.HasIndex(x => x.IsInFlemishRegion);
         }
     }
 }
diff --git a/test/StreetNameRegistry.Tests/ProjectionTests/StreetNameListItemProjectionsV2Tests.cs b/test/StreetNameRegistry.Tests/ProjectionTests/StreetNameListItemProjectionsV2Tests.cs
index 6106fded7..5736877be 100644
--- a/test/StreetNameRegistry.Tests/ProjectionTests/StreetNameListItemProjectionsV2Tests.cs
+++ b/test/StreetNameRegistry.Tests/ProjectionTests/StreetNameListItemProjectionsV2Tests.cs
@@ -4,6 +4,7 @@ namespace StreetNameRegistry.Tests.ProjectionTests
     using System.Linq;
     using System.Threading.Tasks;
     using AutoFixture;
+    using Be.Vlaanderen.Basisregisters.GrAr.Legacy;
     using Be.Vlaanderen.Basisregisters.GrAr.Provenance;
     using FluentAssertions;
     using global::AutoFixture;
@@ -55,6 +56,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Proposed);
@@ -88,6 +90,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Current);
@@ -255,6 +258,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Rejected);
@@ -327,6 +331,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Retired);
@@ -437,6 +442,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Proposed);
@@ -478,6 +484,7 @@ await Sut
                     expectedStreetName.Should().NotBeNull();
                     expectedStreetName.MunicipalityId.Should().Be(streetNameWasProposedV2.MunicipalityId);
                     expectedStreetName.NisCode.Should().Be(streetNameWasProposedV2.NisCode);
+                    expectedStreetName.IsInFlemishRegion.Should().Be(RegionFilter.IsFlemishRegion(streetNameWasProposedV2.NisCode));
                     expectedStreetName.PersistentLocalId.Should().Be(streetNameWasProposedV2.PersistentLocalId);
                     expectedStreetName.Removed.Should().BeFalse();
                     expectedStreetName.Status.Should().Be(StreetNameStatus.Proposed);