Mongolia is divided into 21 provinces or aimags (Mongolian: аймаг) and one provincial municipality. Each aimag is subdivided into several districts.[1] [2] The modern provinces have been established since 1921. The capital, Ulaanbaatar, is governed as an independent provincial municipality separate from Töv Province, inside which it is situated.
| Provinces (Aimags)[3] | Year established | Area (km2)[4] | Population 2020 Census[5] | Density | Capital | |
|---|---|---|---|---|---|---|
| 1931 | 55,313.82 | 94,994 | 1.72 | Tsetserleg[6] | ||
| 1941 | 115,977.80 | 88,672 | 0.76 | Bayankhongor[7] | ||
| 1940 | 45,704.89 | 108,530 | 2.37 | Ölgii | ||
| 1938 | 48,733.00 | 62,089 | 1.27 | Bulgan | ||
| 1994 | 3,275.00 | 107,018 | 33 | Darkhan | ||
| 1941 | 123,597.43 | 82,054 | 0.66 | Choibalsan | ||
| 1931 | 109,472.30 | 71,014 | 0.65 | Sainshand | ||
| 1942 | 74,690.32 | 47,104 | 0.63 | Mandalgovi | ||
| 1940 | 141,447.67 | 57,748 | 0.41 | Altai City | ||
| 1996 | 5,541.80 | 17,928 | 3.23 | Choir | ||
| 1930 | 80,325.08 | 77,957 | 0.97 | Öndörkhaan | ||
| 1931 | 76,060.38 | 89,712 | 1.18 | Khovd | ||
| 1931 | 100,628.82 | 135,095 | 1.34 | Mörön | ||
| 1994 | 844.00 | 107,634 | 128 | Erdenet | ||
| 1931 | 165,380.47 | 69,187 | 0.42 | Dalanzadgad | ||
| 1931 | 62,895.33 | 116,732 | 1.86 | Arvaikheer | ||
| 1934 | 41,152.63 | 110,110 | 2.68 | Sükhbaatar | ||
| 1943 | 82,287.15 | 63,182 | 0.77 | Baruun-Urt | ||
| 1931 | 74,042.37 | 94,250 | 1.27 | Zuunmod | ||
| 1931 | 69,585.39 | 83,223 | 1.20 | Ulaangom | ||
| 1931 | 82,455.66 | 72,823 | 0.88 | Uliastai | ||
(provincial municipality) | 1942 | 4,704.40 | 1,539,810 | 327 | Ulaanbaatar |