Reduce the list, select first 2 letters of the city:
Listing cities (139 place(s)). Select the City to see the postcode(s):
Listing cities (139 place(s)). Select the City to see the postcode(s):
Position: Postcodes > Japan > Kumamotoken > H.... >
Postcode finder: Japan, List of the cities starting with H. Japan Kumamotoken Postcodes (Desktop version).