| Rank | City | 1990 Population |
|---|---|---|
| 1 | Billings | 81,469 |
| 2 | Great Falls | 55,376 |
| 3 | Missoula | 48,430 |
| 4 | Butte-Silver Bow | 33,252 |
| 5 | Helena | 25,070 |
| 6 | Bozeman | 22,712 |
| 7 | Kalispell | 12,605 |
| 8 | Havre | 10,811 |
| 9 | Anaconda-Deer Lodge County | 10,356 |
| 10 | Miles City | 8,621 |
| 11 | Livingston | 6,904 |
| 12 | Lewistown | 6,009 |
| 13 | Laurel | 5,865 |
| 14 | Sidney | 5,216 |
| 15 | Glendive | 4,822 |
| 16 | Whitefish | 4,621 |
| 17 | Dillon | 4,104 |
| 18 | Glasgow | 3,784 |
| 19 | Polson | 3,562 |
| 20 | Belgrade | 3,374 |
| 21 | Cut Bank | 3,372 |
| 22 | Deer Lodge | 3,362 |
| 23 | Hardin | 3,017 |
| 24 | Wolf Point | 2,937 |
| 25 | Conrad | 2,902 |
| 26 | Hamilton | 2,901 |
| 27 | Columbia Falls | 2,894 |
| 28 | Shelby | 2,795 |
| 29 | Libby | 2,770 |
| 30 | Malta | 2,353 |
| 31 | Forsyth | 2,178 |
| 32 | Plentywood | 2,146 |
| 33 | Red Lodge | 1,979 |
| 34 | Roundup | 1,888 |
| 35 | Baker | 1,824 |
| 36 | Choteau | 1,788 |
| 37 | Fort Benton | 1,660 |
| 38 | Townsend | 1,603 |
| 39 | Columbus | 1,594 |
| 40 | Big Timber | 1,573 |
| 41 | Ronan | 1,565 |
| 42 | Chinook | 1,515 |
| 43 | East Helena | 1,498 |
| 44 | Thompson Falls | 1,355 |
| 45 | Boulder | 1,307 |
| 46 | Stevensville | 1,284 |
| 47 | Scobey | 1,254 |
| 48 | Three Forks | 1,162 |
| 49 | Browning | 1,156 |
| 50 | Harlowton | 1,077 |
| 51 | Whitehall | 1,066 |
| 52 | Manhattan | 1,059 |
| 53 | Eureka | 1,053 |
| 54 | Troy | 1,045 |
| 55 | Plains | 1,000 |
| 56 | White Sulphur Springs | 970 |
| 57 | Chester | 944 |
| 58 | Philipsburg | 924 |
| 59 | West Yellowstone | 905 |
| 60 | Superior | 900 |
| 61 | Harlem | 882 |
| 62 | Poplar | 873 |
| 63 | Fairview | 861 |
| 64 | Culbertson | 803 |
| 65 | Ennis | 785 |
| 66 | Circle | 777 |
| 67 | St. Ignatius | 761 |
| 68 | Big Sandy | 744 |
| 69 | Darby | 708 |
| 70 | Bridger | 692 |
| 71 | Walkerville | 689 |
| 72 | Pinesdale | 668 |
| 73 | Sheridan | 662 |
| 74 | Terry | 659 |
| 75 | Fairfield | 656 |
| 76 | Wibaux | 628 |
| 77 | Cascade | 608 |
| 78 | Broadus | 583 |
| 79 | Joliet | 554 |
| 80 | Belt | 544 |
| 81 | Stanford | 529 |
| 82 | Valier | 524 |
| 83 | Lodge Grass | 517 |
| 84 | Jordan | 494 |
| 85 | Ekalaka | 439 |
| 86 | Sunburst | 437 |
| 87 | Hot Springs | 436 |
| 88 | Dutton | 392 |
| 89 | Nashua | 379 |
| 90 | Twin Bridges | 374 |
| 91 | Fromberg | 372 |
| 92 | Hysham | 371 |
| 93 | Brockton | 365 |
| 94 | Medicine Lake | 362 |
| 95 | Alberton | 354 |
| 96 | Denton | 350 |
| 97 | Geraldine | 299 |
| 98 | Clyde Park | 282 |
| 99 | Lima | 265 |
| 100 | Saco | 263 |
In 1990, the largest city in Montana was Billings, with a population of 81,469. The second largest city is Great Falls, with a population of 55,376.
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