Models

project/main/models/__init__.py

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+from .area import Area
+from .county import County
+from .post_office import PostOffice

project/main/models/area.py

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+from django.db import models
+
+
+class Area(models.Model):
+    name = models.CharField(max_length=100)
+    post_office = models.ForeignKey("PostOffice", on_delete=models.CASCADE)
+    county = models.ForeignKey("County", on_delete=models.CASCADE)
+
+    class Meta:
+        db_table = "areas"
+        ordering = ["name"]

project/main/models/county.py

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+from django.db import models
+
+
+class County(models.Model):
+    name = models.CharField(max_length=100)
+
+    class Meta:
+        db_table = "counties"
+        ordering = ["name"]

project/main/models/post_office.py

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+from django.db import models
+
+
+class PostOffice(models.Model):
+    zip = models.PositiveIntegerField()
+    name = models.CharField(max_length=100)
+
+    class Meta:
+        db_table = "post_offices"
+        ordering = ["zip"]