Maqu County (Tibetanརྨ་ཆུ་རྫོང，Rma chu rdzong) is an administrative district in Gansu, the People's Republic of China. It is one of 58 counties of Gansu. It is part of the Gannan Prefecture. Its postal code is 747300, and in 1999 its population was 36,213 people. The area of Maqu County is 10,191 km2 with an average altitude of 3,700 meters.