diff --git a/src/cities_light/abstract_models.py b/src/cities_light/abstract_models.py
index 89457fc0..11eaaaa6 100644
--- a/src/cities_light/abstract_models.py
+++ b/src/cities_light/abstract_models.py
@@ -128,7 +128,7 @@ class AbstractRegion(Base):
                                     db_index=True)
 
     country = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.Country',
-                                on_delete=models.CASCADE)
+                                on_delete=models.CASCADE, to_field='geoname_id')
 
     class Meta(Base.Meta):
         unique_together = (('country', 'name'), ('country', 'slug'))
@@ -150,10 +150,10 @@ class AbstractSubRegion(Base):
                                     db_index=True)
 
     country = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.Country',
-                                on_delete=models.CASCADE)
+                                on_delete=models.CASCADE, to_field='geoname_id')
     region = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.Region',
                                null=True, blank=True,
-                               on_delete=models.CASCADE)
+                               on_delete=models.CASCADE, to_field='geoname_id')
 
     class Meta(Base.Meta):
         verbose_name = _('SubRegion')
@@ -191,11 +191,11 @@ class AbstractCity(Base):
 
     subregion = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.SubRegion',
                                   blank=True, null=True,
-                                  on_delete=models.CASCADE)
+                                  on_delete=models.CASCADE, to_field='geoname_id')
     region = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.Region', blank=True,
-                               null=True, on_delete=models.CASCADE)
+                               null=True, on_delete=models.CASCADE, to_field='geoname_id')
     country = models.ForeignKey(CITIES_LIGHT_APP_NAME + '.Country',
-                                on_delete=models.CASCADE)
+                                on_delete=models.CASCADE, to_field='geoname_id')
     population = models.BigIntegerField(null=True, blank=True, db_index=True)
     feature_code = models.CharField(max_length=10, null=True, blank=True,
                                     db_index=True)
diff --git a/src/cities_light/management/commands/cities_light.py b/src/cities_light/management/commands/cities_light.py
index 193225ca..efc73503 100644
--- a/src/cities_light/management/commands/cities_light.py
+++ b/src/cities_light/management/commands/cities_light.py
@@ -273,7 +273,7 @@ def _get_country_id(self, country_code2):
         """
         if country_code2 not in self._country_codes:
             self._country_codes[country_code2] = \
-                Country.objects.get(code2=country_code2).pk
+                Country.objects.get(code2=country_code2).geoname_id
 
         return self._country_codes[country_code2]
 
@@ -284,7 +284,7 @@ def _get_region_id(self, country_code2, region_id):
         country_id = self._get_country_id(country_code2)
         if region_id not in self._region_codes[country_id]:
             self._region_codes[country_id][region_id] = Region.objects.get(
-                country_id=country_id, geoname_code=region_id).pk
+                country_id=country_id, geoname_code=region_id).geoname_id
 
         return self._region_codes[country_id][region_id]
 
@@ -296,13 +296,13 @@ def _get_subregion_id(self, country_code2, region_id, subregion_id):
         country_id = self._get_country_id(country_code2)
         if region_id not in self._region_codes[country_id]:
             self._region_codes[country_id][region_id] = Region.objects.get(
-                country_id=country_id, geoname_code=region_id).pk
+                country_id=country_id, geoname_code=region_id).geoname_id
 
         if subregion_id not in self._subregion_codes[country_id][region_id]:
             self._subregion_codes[country_id][region_id][subregion_id] = \
                 SubRegion.objects.get(
                     region_id=self._region_codes[country_id][region_id],
-                    geoname_code=subregion_id).pk
+                    geoname_code=subregion_id).geoname_id
         return self._subregion_codes[country_id][region_id][subregion_id]
 
     def country_import(self, items):
diff --git a/src/cities_light/migrations/0012_alter_city_country_alter_city_region_and_more.py b/src/cities_light/migrations/0012_alter_city_country_alter_city_region_and_more.py
new file mode 100644
index 00000000..4d5aa9a8
--- /dev/null
+++ b/src/cities_light/migrations/0012_alter_city_country_alter_city_region_and_more.py
@@ -0,0 +1,74 @@
+# Generated by Django 5.0.6 on 2024-06-09 22:26
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("cities_light", "0011_alter_city_country_alter_city_region_and_more"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="city",
+            name="country",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.country",
+                to_field="geoname_id",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="city",
+            name="region",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.region",
+                to_field="geoname_id",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="city",
+            name="subregion",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.subregion",
+                to_field="geoname_id",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="region",
+            name="country",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.country",
+                to_field="geoname_id",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subregion",
+            name="country",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.country",
+                to_field="geoname_id",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="subregion",
+            name="region",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="cities_light.region",
+                to_field="geoname_id",
+            ),
+        ),
+    ]