diff --git a/codecarbon/core/emissions.py b/codecarbon/core/emissions.py
index e71aa60b3..64ca83250 100644
--- a/codecarbon/core/emissions.py
+++ b/codecarbon/core/emissions.py
@@ -146,7 +146,7 @@ def get_cloud_geo_region(self, cloud: CloudMetadata) -> str:
             )
 
         state = selected["state"].item()
-        if state is not None:
+        if isinstance(state, str):
             return state
         city = selected["city"].item()
         return city
diff --git a/tests/test_emissions.py b/tests/test_emissions.py
index 8dd5c3856..d44a26c7f 100644
--- a/tests/test_emissions.py
+++ b/tests/test_emissions.py
@@ -47,6 +47,24 @@ def test_emissions_CLOUD_GCP(self):
         assert isinstance(emissions, float)
         self.assertAlmostEqual(emissions, 0.0010, places=2)
 
+    def test_get_cloud_geo_region_returns_state(self):
+        # WHEN
+        region = self._emissions.get_cloud_geo_region(
+            CloudMetadata(provider="gcp", region="us-central1")
+        )
+
+        # THEN
+        self.assertEqual(region, "Iowa")
+
+    def test_get_cloud_geo_region_falls_back_to_city_without_state(self):
+        # WHEN
+        region = self._emissions.get_cloud_geo_region(
+            CloudMetadata(provider="gcp", region="asia-east1")
+        )
+
+        # THEN
+        self.assertEqual(region, "Changhua County")
+
     def test_get_carbon_intensity_per_source_data(self):
         # pytest tests/test_emissions.py::TestEmissions::test_get_carbon_intensity_per_source_data
         carbon_intensity = DataSource().get_carbon_intensity_per_source_data()