| Rank | City | 2000 Population |
|---|---|---|
| 1 | Dubois | 972 |
| 2 | Bar Nunn | 937 |
| 3 | Upton | 876 |
| 4 | Marbleton | 783 |
| 5 | Laramie | 27,298 |
| 6 | Star Valley Ranch | 651 |
| 7 | Baggs | 348 |
| 8 | Thayne | 351 |
| 9 | Meeteetse | 351 |
| 10 | La Grange | 336 |
| 11 | Ten Sleep | 312 |
| 12 | Pine Haven | 224 |
| 13 | Frannie | 208 |
| 14 | Hartville | 75 |
| 15 | Riverside | 59 |
| 16 | Riverton | 9,277 |
| 17 | Cody | 8,894 |
| 18 | Powell | 5,585 |
| 19 | Worland | 5,308 |
| 20 | Buffalo | 3,924 |
| 21 | Mills | 3,179 |
| 22 | Thermopolis | 3,160 |
| 23 | Casper | 49,719 |
| 24 | Evansville | 2,260 |
| 25 | Hanna | 870 |
| 26 | Greybull | 1,806 |
| 27 | Diamondville | 715 |
| 28 | Pinedale | 1,409 |
| 29 | Ranchester | 702 |
| 30 | Dayton | 695 |
| 31 | Alpine | 562 |
| 32 | Mountain View | 1,162 |
| 33 | Van Tassell | 18 |
| 34 | Lost Springs | 1 |
| 35 | Shoshoni | 635 |
| 36 | Cowley | 560 |
| 37 | Byron | 555 |
| 38 | La Barge | 430 |
| 39 | Big Piney | 428 |
| 40 | Lingle | 510 |
| 41 | Cokeville | 508 |
| 42 | Bear River | 475 |
| 43 | Rolling Hills | 458 |
| 44 | Encampment | 441 |
| 45 | Hudson | 407 |
| 46 | Wamsutter | 260 |
| 47 | Hulett | 436 |
| 48 | Sinclair | 421 |
| 49 | Midwest | 408 |
| 50 | Superior | 243 |
| 51 | Burns | 286 |
| 52 | Medicine Bow | 273 |
| 53 | East Thermopolis | 273 |
| 54 | Kaycee | 250 |
| 55 | Burlington | 249 |
| 56 | Fort Laramie | 243 |
| 57 | Chugwater | 242 |
| 58 | Rock River | 235 |
| 59 | Glendo | 228 |
| 60 | Elk Mountain | 191 |
| 61 | Edgerton | 169 |
| 62 | Pavillion | 165 |
| 63 | Deaver | 176 |
| 64 | Yoder | 169 |
| 65 | Granger | 146 |
| 66 | Albin | 120 |
| 67 | Clearmont | 115 |
| 68 | Manderson | 104 |
| 69 | Manville | 102 |
| 70 | Opal | 102 |
| 71 | Bairoil | 97 |
| 72 | Dixon | 79 |
| 73 | Kirby | 55 |
| 74 | Green River | 11,761 |
| 75 | Evanston | 11,474 |
| 76 | Rawlins | 9,019 |
| 77 | Jackson | 8,681 |
| 78 | Lander | 6,929 |
| 79 | Torrington | 5,846 |
| 80 | Douglas | 5,325 |
| 81 | Wheatland | 3,524 |
| 82 | Newcastle | 3,264 |
| 83 | Kemmerer | 2,646 |
| 84 | Lovell | 2,354 |
| 85 | Glenrock | 2,251 |
| 86 | Lyman | 1,933 |
| 87 | Afton | 1,853 |
| 88 | Wright | 1,357 |
| 89 | Gillette | 20,477 |
| 90 | Rock Springs | 18,588 |
| 91 | Sheridan | 15,899 |
| 92 | Saratoga | 1,720 |
| 93 | Lusk | 1,438 |
| 94 | Basin | 1,241 |
| 95 | Sundance | 1,211 |
| 96 | Pine Bluffs | 1,155 |
| 97 | Guernsey | 1,139 |
| 98 | Moorcroft | 827 |
| 99 | Cheyenne | 53,411 |
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