Reduce the list, select first 2 letters of the city:
Listing cities (199 place(s)). Select the City to see the postcode(s):
Listing cities (199 place(s)). Select the City to see the postcode(s):
Position: Postcodes > Japan > Ibarakiken > H.... >
Postcode finder: Japan, List of the cities starting with H. Japan Ibarakiken Postcodes (Desktop version).