Mian County, under the Hanzhong City of Shanxi Province, is located in the west of Hanzhong City, east Hantai District, south of Nanzheng County, west of Ningqiang County, Yongyang County, north of Liuba County, Gansu Province Liangtang County bordering, an area of 2406 square kilometers. As of October 2022, Mian County has jurisdiction over 1 subdistrict and 17 towns. In 2021, the total population of Mian County was 408,940.

Mian County, known as the "northwest Jiangnan" "the hometown of fish and rice" reputation. In the Warring States period, the land was first known as the White Horse, which belongs to Shu. Qin belongs to Bao County. At the beginning of the Western Han Dynasty, part of Mianyang County was built west of the Waiheba by Baoxian County. The Three Kingdoms period, Cao Wei Jing Yuan four years (262 years), Miyang belongs to Hanzhong County Liangzhou. Ming Hongwu seventh year (1374) July, changed to Mixian County. In September 1964, Mixian County was changed to Mian County. Mian County is rich in historical relics and cultural accumulation. The cultural relics of the two Han and three Kingdoms represented by Dingjun Mountain, Tiandang Mountain and Marquis Wu's tomb (ancestral hall) are well-known at home and abroad.

In 2021, the GDP of Mian County is 17.874 billion yuan, the per capita disposable income of urban residents is 37,182 yuan and the per capita disposable income of rural residents is 13,359 yuan.