Spanning 1,321 square kilometres (510 sq mi), with 392,606 inhabitants (2020 Census),[1] it is subdivided into 4 subdistricts and 9 towns.

It borders the Beijing districts of Changping to the northeast, Haidian and Shijingshan to the east, Fengtai to the southeast, and Fangshan to the south, as well as Hebei province to the west and northwest.

The 6th Ring Road runs through the eastern part of Mentougou District.

There are 4 subdistricts and 9 towns (including 3 towns of which carry the "area" label):[2] Mentougou District has a humid continental climate (Köppen climate classification Dwa).

The average annual rainfall is 568.6 mm (22.39 in) with July as the wettest month.