Reduce the list, select first 2 letters of the city:
Listing cities (279 place(s)). Select the City to see the postcode(s):
Listing cities (279 place(s)). Select the City to see the postcode(s):
Position: Postcodes > Mexico > Guanajuato > C.... >
Postcode finder: Mexico, List of the cities starting with C. Mexico Guanajuato Postcodes (Desktop version).