Reduce the list, select first 2 letters of the city:
Listing cities (49 place(s)). Select the City to see the postcode(s):
Listing cities (49 place(s)). Select the City to see the postcode(s):
Position: Postcodes > United States > Iowa > G.... >
Postcode finder: United States, List of the cities starting with G. United States Iowa Postcodes (Desktop version).