Administrative divisions of Mongolia

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Administrative divisions of Mongolia
First level
aimag (аймаг)

Capital city
niislel (нийслэл)

Second level
sum (сум)

Municipal District
düüreg (дүүрэг)

Third level
bag (баг)

Municipal Subdistrict
khoroo (хороо)

The country of Mongolia is divided into 21 provinces (Mongolian: аймаг, aimag) and the capital (нийслэл, niislel) Ulaanbaatar.[1]

For details about the provinces see: Provinces of Mongolia.

Secondary subdivisions outside Ulaanbaatar are called "sum" (сум, often transcribed as soum). In 2006, Mongolia had 331 sums.[2] Sums are further subdivided into bags (баг). While sums always have a permanent settlement as administrative center, many bags don't.

Ulaanbaatar is divided into nine düüregs (дүүрэг, usually translated as district), which are further subdivided into khoroos (хороо, most often translated as subdistrict, microdistrict or simply district).


  • Mongolian constitution, article 57
  1. Mongolian Statistical Yearbook 2006, p.62,63
  2. Mongolian Statistical Yearbook 2006, p.64