The postcode of Heishan County, Jinzhou City, Liaoning Province.

The postcode of this place is 12 1400.

The first two digits of the postal code "12" represent the postal code of Liaoning Province, the third digit "1" represents the postal code of Jinzhou City, and the last three digits "400" represent the postal code of Heishan County. This coding system is helpful for postal services to deliver mail and parcels quickly and accurately, and improve the efficiency and quality of postal services. Postal code is a code consisting of a series of numbers, which is used to identify the sending and receiving place of mail.