According to the zip code library query, Gannan County's zip code is 162100, area code is 0452, and the administrative code is 230225.

Gannan County belongs to the city of Qiqihar, Heilongjiang Province, is located in the southern foothills of the Daxing'anling Mountains, the Nenjiang River in the middle reaches of the impact of the plains on the right bank of the Nomin River to the East Nenjiang River, with the Inner Mongolia Autonomous Region Moli Dawa Banner, Heilongjiang Province, Nehe City, Fuyu County, south and Longjiang County, Qiqihar City, Meiris Daur Autonomous Region border, west and north to the remains of the Jin Dynasty, "Northeast Road Trench" and the Inner Mongolia Autonomous Region, Buteha Banner, Arong Banner, across the border as neighbors.