| Rank | City | 1990 Population |
|---|---|---|
| 1 | Cheyenne | 50,209 |
| 2 | Casper | 46,843 |
| 3 | Laramie | 26,695 |
| 4 | Rock Springs | 19,134 |
| 5 | Gillette | 17,774 |
| 6 | Sheridan | 14,024 |
| 7 | Green River | 12,713 |
| 8 | Evanston | 11,012 |
| 9 | Riverton | 9,688 |
| 10 | Rawlins | 9,521 |
| 11 | Cody | 8,297 |
| 12 | Lander | 6,541 |
| 13 | Torrington | 5,947 |
| 14 | Worland | 5,812 |
| 15 | Powell | 5,171 |
| 16 | Douglas | 5,146 |
| 17 | Jackson | 5,127 |
| 18 | Buffalo | 3,439 |
| 19 | Newcastle | 3,306 |
| 20 | Thermopolis | 3,293 |
| 21 | Wheatland | 3,245 |
| 22 | Kemmerer | 3,074 |
| 23 | Mills | 2,261 |
| 24 | Lovell | 2,179 |
| 25 | Glenrock | 2,132 |
| 26 | Saratoga | 1,963 |
| 27 | Lyman | 1,887 |
| 28 | Greybull | 1,764 |
| 29 | Afton | 1,686 |
| 30 | Lusk | 1,557 |
| 31 | Evansville | 1,480 |
| 32 | Basin | 1,272 |
| 33 | Wright | 1,236 |
| 34 | Pinedale | 1,195 |
| 35 | Guernsey | 1,155 |
| 36 | Sundance | 1,150 |
| 37 | Mountain View | 1,119 |
| 38 | Hanna | 1,041 |
| 39 | Pine Bluffs | 1,037 |
| 40 | Upton | 942 |
| 41 | Dubois | 899 |
| 42 | Diamondville | 864 |
| 43 | Bar Nunn | 843 |
| 44 | Moorcroft | 771 |
| 45 | Ranchester | 681 |
| 46 | Marbleton | 635 |
| 47 | Dayton | 571 |
| 48 | La Barge | 525 |
| 49 | Grand Encampment | 508 |
| 50 | Shoshoni | 502 |
| 51 | Cowley | 499 |
| 52 | Midwest | 496 |
| 53 | Cokeville | 486 |
| 54 | Lingle | 482 |
| 55 | Hulett | 469 |
| 56 | Sinclair | 463 |
| 57 | Big Piney | 455 |
| 58 | Byron | 426 |
| 59 | Medicine Bow | 408 |
| 60 | Hudson | 388 |
| 61 | Meeteetse | 368 |
| 62 | Rolling Hills | 336 |
| 63 | Ten Sleep | 311 |
| 64 | Superior | 273 |
| 65 | Thayne | 267 |
| 66 | Burns | 261 |
| 67 | Fort Laramie | 251 |
| 68 | Baggs | 249 |
| 69 | Edgerton | 246 |
| 70 | Wamsutter | 240 |
| 71 | Kaycee | 232 |
| 72 | Bairoil | 228 |
| 73 | La Grange | 224 |
| 74 | Rock River | 222 |
| 75 | East Thermopolis | 217 |
| 76 | Deaver | 212 |
| 77 | Alpine | 204 |
| 78 | Burlington | 199 |
| 79 | Chugwater | 195 |
| 80 | Glendo | 193 |
| 81 | Elk Mountain | 186 |
| 82 | Frannie | 155 |
| 83 | Pine Haven | 141 |
| 84 | Yoder | 136 |
| 85 | Pavillion | 126 |
| 86 | Albin | 120 |
| 87 | Clearmont | 119 |
| 88 | Granger | 106 |
| 89 | Manville | 102 |
| 90 | Opal | 95 |
| 91 | Manderson | 79 |
| 92 | Hartville | 78 |
| 93 | Riverside | 68 |
| 94 | Dixon | 59 |
| 95 | Kirby | 59 |
| 96 | Van Tassell | 8 |
| 97 | Lost Springs | 4 |
In 1990, the largest city in Wyoming was Cheyenne, with a population of 50,209. The second largest city is Casper, with a population of 46,843.
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