This list includes cities in Mongolia of more than 7,500 inhabitants. The results are from the census of January 5, 2000 as well as from a population estimation for the end of 2008. If 2008 year data was not accessible, the closest and most reliable data was used and noted by an index.
The population for previous years show the historical significance of population growth and urbanisation throughout Mongolia.
The higher level administrative unit is the aimag, except for Ulaanbaatar which administers its own federal district (Nalaikh and Baganuur are administered by Ulaanbaatar). The numbers of inhabitants relate to the cities proper without surrounding districts.
| Rank | Name | 1979 est.[1] [2] [3] | 1989 est.[4] [5] | 2000 census[6] [7] | 2010 Census[8] | Change since 2000 Census | Province/Municipality | |
|---|---|---|---|---|---|---|---|---|
| 1 | 396,300 | 540,600 | 760,077 | 1,144,954 | 299,715[9] | Ulaanbaatar | ||
| 2 | 29,100 | style="text-align: center; background:;" | - | 70,950 | 83,379 | 12,429 | Orkhon Province | |
| 3 | 49,100 | style="text-align: center; background:;" | - | 65,791 | 74,738 | 8,947 | Darkhan-Uul Province | |
| 4 | 28,500 | 37,300 | 40,123 | 38,537 | 1,586 | Dornod Province | ||
| 5 | 16,500 | 21,300 | 28,903 | 35,789 | 6,886 | Khövsgöl Province | ||
| 6 | - | style="text-align: center; background:;" | - | 23,600 | 30,049 | 6,449 | Ulaanbaatar | |
| 7 | 16,300 | 21,200 | 22,066 | 29,817 | 7,751 | Bayankhongor Province | ||
| 8 | 18,700 | 27,200 | 25,791 | 29,392 | 3,601 | Bayan-Ölgii Province | ||
| 9 | 17,500 | 24,100 | 25,765 | 29,012 | 3,247 | Khovd Province | ||
| 10 | 12,300 | 16,900 | 19,058 | 27,162 | 8,104 | Övörkhangai Province | ||
| 11 | 17,900 | 22,900 | 25,993 | 27,152 | 1,159 | Uvs Province | ||
| 12 | - | style="text-align: center; background:;" | - | 21,100 | 22,210 | 1,110 | Ulaanbaatar | |
| 14 | 11,100 | 10,300 | 18,290 | 20,515 | 2,225 | Dornogovi Province | ||
| 13 | 14,700 | 20,300 | 18,519 | 20,604 | 2,085 | Arkhangai Province | ||
| 15 | 14,300 | 19,600 | 22,374 | 19,662 | 2,712 | Selenge Province | ||
| 16 | 11,100 | 14,400 | 18,003 | 19,000 | 997 | Khentii Province | ||
| 17 | 10,000 | 14,300 | 14,050 | 18,740 | 4,690 | Ömnögovi Province | ||
| 18 | 11,400 | - | 15,000(2004) | 18,002 | Selenge Province | |||
| 19 | 15,400 | 20,300 | 18,154 | 17,468 | 686 | Zavkhan Province | ||
| 20 | 13,700 | 18,800 | 15,741 | 16,542 | 801 | Govi-Altai Province | ||
| 21 | 11,600 | 16,100 | 15,133 | 16,130 | 997 | Sükhbaatar Province | ||
| 22 | 10,200 | 16,100 | 14,517 | 13,660 | 857 | Dundgovi Province | ||
| 23 | 9,800 | 15,800 | 14,837 | 13,330 | 1,507 | Töv Province | ||
| 24 | - | style="text-align: center; background:;" | - | 5,486 | 13,285 | 7,799 | Dornogovi Province | |
| 25 | 11,300 | 12,800 | 12,681 | 11,320 | 1,361 | Bulgan Province | ||
| 26 | - | style="text-align: center; background:;" | - | 13,648 | 10,847 | 2,801 | Övörkhangai Province | |
| 27 | 4,500 | style="text-align: center; background:;" | - | 8,983 | 9,708 | 725 | Govisümber Province | |
| 28 | - | style="text-align: center; background:;" | - | 6,406(2001) | 8,080 | Khentii Province | ||
| 29 | - | - | 8,902 | 7,795 | 1,107 | Darkhan-Uul Province |
Colour key:
Notes: