According to the postcode database, the postcode of Gu 'an County, Langfang City, Hebei Province is 065500. The first two digits 06 represent Hebei Province, the third digit 5 represents Langfang City, the fourth digit 5 represents Gu 'an County, and the last two digits 00 represent the specific delivery area. Gu 'an County is subordinate to Langfang City, Hebei Province. Located in the northern part of North China Plain, the hinterland of Beijing-Tianjin-Baoding Triangle. The county government is located at Xinzhong Street 188.