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 > Indonesia > East Kalimantan > S.... >
Postcode finder: Indonesia, List of the cities starting with S. Indonesia East Kalimantan Postcodes (Desktop version).