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|Country||People's Republic of China|
|County seat||Chengguan (城关镇)|
|• Total||1,780 km2 (690 sq mi)|
|• Density||140/km2 (360/sq mi)|
|Time zone||UTC+8 (China Standard)|
Cheng County or Chengxian (simplified Chinese: 成县; traditional Chinese: 成縣; pinyin: Chéng Xiàn) is a county under the administration of Longnan City, in southeastern Gansu Province of China. It has a land area of 1,780 square kilometers and a population of 250,000 in 2004. The postal code is 742500, and the county seat is located in Chengguan Town.
Located between mountains, it has a temperate climate, favourable for agriculture. The mountains have lead and zinc ore deposits.
Chengxian is noted for its walnut production. Chengxian walnuts were designated a protected origin product in China in 2014.
Cheng County is divided to 14 towns and 3 townships.
- Towns are upgraded from Township.
-Former Townships are merged to other.
- "成县县情概况" [Overview of Chengxian County]. Archived from the original on 3 July 2014.
- "甘肃成县：小核桃撬动扶贫大格局-新华网". www.xinhuanet.com. Retrieved 2021-02-11.
- "甘肃成县官方：嘉陵江支流青泥河受污水体持续达标-中新网". www.chinanews.com. Retrieved 2021-02-11.