diff --git a/scripts/migrate_csv_to_db.py b/scripts/migrate_csv_to_db.py
index 7891bd3..bd1f3b1 100644
--- a/scripts/migrate_csv_to_db.py
+++ b/scripts/migrate_csv_to_db.py
@@ -195,7 +195,16 @@ def migrate_data(df: pd.DataFrame, geocode: bool = False):
         schools_created = 0
         
         for _, row in school_data.iterrows():
-            urn = int(row['urn']) if pd.notna(row.get('urn')) else None
+            # Safely parse URN - handle None, NaN, whitespace, and invalid values
+            urn_val = row.get('urn')
+            urn = None
+            if pd.notna(urn_val):
+                try:
+                    urn_str = str(urn_val).strip()
+                    if urn_str:
+                        urn = int(float(urn_str))  # Handle "12345.0" format
+                except (ValueError, TypeError):
+                    pass
             if not urn:
                 continue
             
@@ -207,11 +216,22 @@ def migrate_data(df: pd.DataFrame, geocode: bool = False):
                 if coords:
                     lat, lon = coords
             
+            # Safely parse local_authority_code
+            la_code = None
+            la_code_val = row.get('local_authority_code')
+            if pd.notna(la_code_val):
+                try:
+                    la_code_str = str(la_code_val).strip()
+                    if la_code_str:
+                        la_code = int(float(la_code_str))
+                except (ValueError, TypeError):
+                    pass
+            
             school = School(
                 urn=urn,
                 school_name=row.get('school_name') if pd.notna(row.get('school_name')) else 'Unknown',
                 local_authority=row.get('local_authority') if pd.notna(row.get('local_authority')) else None,
-                local_authority_code=int(row.get('local_authority_code')) if pd.notna(row.get('local_authority_code')) else None,
+                local_authority_code=la_code,
                 school_type=row.get('school_type') if pd.notna(row.get('school_type')) else None,
                 school_type_code=row.get('school_type_code') if pd.notna(row.get('school_type_code')) else None,
                 religious_denomination=row.get('religious_denomination') if pd.notna(row.get('religious_denomination')) else None,
@@ -238,12 +258,29 @@ def migrate_data(df: pd.DataFrame, geocode: bool = False):
         results_created = 0
         
         for _, row in df.iterrows():
-            urn = int(row['urn']) if pd.notna(row.get('urn')) else None
+            # Safely parse URN
+            urn_val = row.get('urn')
+            urn = None
+            if pd.notna(urn_val):
+                try:
+                    urn_str = str(urn_val).strip()
+                    if urn_str:
+                        urn = int(float(urn_str))
+                except (ValueError, TypeError):
+                    pass
             if not urn or urn not in urn_to_school_id:
                 continue
             
             school_id = urn_to_school_id[urn]
-            year = int(row['year']) if pd.notna(row.get('year')) else None
+            
+            # Safely parse year
+            year_val = row.get('year')
+            year = None
+            if pd.notna(year_val):
+                try:
+                    year = int(float(str(year_val).strip()))
+                except (ValueError, TypeError):
+                    pass
             if not year:
                 continue