diff --git a/profiles/models.py b/profiles/models.py
index adbded3..3f43c45 100644
--- a/profiles/models.py
+++ b/profiles/models.py
@@ -1,4 +1,5 @@
 from django.db import models
+from django.db.models import Sum
 
 
 class Question(models.Model):
@@ -224,3 +225,10 @@ def __str__(self):
 class CumulativeResultCount(Result):
     class Meta:
         proxy = True
+
+    def get_sum_of_count(self, postal_code_type_name=PostalCodeType.HOME_POSTAL_CODE):
+        postal_code_type = PostalCodeType.objects.get(type_name=postal_code_type_name)
+        qs = PostalCodeResult.objects.filter(
+            postal_code_type=postal_code_type, result=self
+        )
+        return qs.aggregate(sum_of_count=Sum("count"))["sum_of_count"]