Reduce the list, select first 2 letters of the city:
Listing cities (374 place(s)). Select the City to see the postcode(s):
Listing cities (374 place(s)). Select the City to see the postcode(s):
Position: Postcodes > Japan > Fukushimaken > K.... >
Postcode finder: Japan, List of the cities starting with K. Japan Fukushimaken Postcodes (Desktop version).