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|• Pinyin||Chéng Xiàn|
|County seat||Chengguan (城关镇)|
|• Total||1,701 km2 (657 sq mi)|
|• Density||150/km2 (380/sq mi)|
|Time zone||China Standard (UTC+8)|
Cheng County or Chengxian (Chinese: 成县; Pinyin: Chéng Xiàn) is a county under charge of Longnan City, Gansu Province of China. It has a land area of 1,701 square kilometers and a population of 250,000 in 2004. The postal code is 742500, and the county seat is located in Chengguan Town.
- Towns: Chengguan, Huangzhu, Hongchuan, Xiaochuan, Zhifang and Paosha.
- Townships: Zhiqi, Diancun, Nankang, Songping, Shuiquan, Wangmo, Erlang, Chenyuan, Shaba, Suyuan, Suochi, Huangchen, Huaya, Tanhe, Tanba and Daping.
There are Mount Jifeng and a national forest park within the region.