Yongchang County is subordinate to Jinchang City of Gansu Province, located in the northwest of Gansu Province, located in the east of Hexi Corridor, the north foot of Qilian Mountains, the south edge of Alashan platform. Wuwei in the east, Jinchuan in the north, Shandan in the west, and Sunan in the south. The geographical coordinates are 101°04 '-- 102°43' east longitude and 37°47 '-- 38°39' north latitude. The longest distance between east and west is 144.8 kilometers, and the widest distance between north and south is 144.55 kilometers, with a total area of 6,763,790,000 mu.

As of 2019, Yongchang County has jurisdiction over 9 towns and 1 township. The majority of the population in Yongchang County is Han, with Mongolian, Hui, Pan and other ethnic minorities. According to the seventh census, the permanent population of Yongchang County was 177,641 as of midnight on November 1, 2020.

On Oct 10, 2018, the government of Gansu province approved the withdrawal of Yongchang County from the poverty-stricken county. On July 29, 2020, it was selected into the national Health township (county) naming list for the 2017-2019 cycle.

In 2020, the regional GDP of Yongchang County reached 8.72 billion yuan, of which the added value of the primary industry was 2.197 billion yuan, the secondary industry 2.63 billion yuan and the tertiary industry 4.16 billion yuan.