81 cities
| City | State | 2026 Pop. ↓ | Annual Change | Rank | Type |
|---|---|---|---|---|---|
| Phoenix | Arizona | 1,703,449 | 0.9% | 1 | City |
| Denver | Colorado | 734,718 | 0.39% | 2 | City |
| Tucson | Arizona | 559,695 | 0.51% | 3 | City |
| Albuquerque | New Mexico | 558,046 | -0.2% | 4 | City |
| Mesa | Arizona | 522,751 | 0.54% | 5 | City |
| Colorado Springs | Colorado | 499,474 | 0.6% | 6 | City |
| Aurora | Colorado | 411,293 | 1% | 7 | City |
| Gilbert | Arizona | 298,470 | 1.65% | 8 | Town |
| Chandler | Arizona | 283,132 | 0.34% | 9 | City |
| Glendale | Arizona | 262,745 | 0.88% | 10 | City |
| Scottsdale | Arizona | 248,321 | 0.44% | 11 | City |
| Boise City | Idaho | 238,923 | 0.2% | 12 | City |
| Salt Lake City | Utah | 226,341 | 1.93% | 13 | City |
| Peoria | Arizona | 203,891 | 0.98% | 14 | City |
| Tempe | Arizona | 192,514 | 0.63% | 15 | City |
| Surprise | Arizona | 179,149 | 3.34% | 16 | City |
| Fort Collins | Colorado | 171,391 | 0.14% | 17 | City |
| Lakewood | Colorado | 157,161 | 0.09% | 18 | City |
| Meridian | Idaho | 149,862 | 3.5% | 19 | City |
| Thornton | Colorado | 148,938 | 0.76% | 20 | City |
| West Valley City | Utah | 137,218 | -0.34% | 21 | City |
| Goodyear | Arizona | 128,372 | 4.13% | 22 | City |
| Nampa | Idaho | 125,310 | 3.28% | 23 | City |
| Buckeye | Arizona | 124,630 | 4.31% | 24 | City |
| Billings | Montana | 123,608 | 0.87% | 25 | City |
| Arvada | Colorado | 120,628 | -0.51% | 26 | City |
| Las Cruces | New Mexico | 119,636 | 1.11% | 27 | City |
| Greeley | Colorado | 116,900 | 1.1% | 28 | City |
| Rio Rancho | New Mexico | 116,565 | 1.76% | 29 | City |
| West Jordan | Utah | 116,515 | -0.07% | 30 | City |
| Provo | Utah | 115,666 | 0.08% | 31 | City |
| Westminster | Colorado | 114,626 | -0.29% | 32 | City |
| St. George | Utah | 111,407 | 2.35% | 33 | City |
| Pueblo | Colorado | 110,794 | -0.17% | 34 | City |
| San Tan Valley | Arizona | 110,749 | 1.69% | 35 | CDP |
| Centennial | Colorado | 109,178 | 0.15% | 36 | City |
| Yuma | Arizona | 106,667 | 1.48% | 37 | City |
| Boulder | Colorado | 105,995 | -0.38% | 38 | City |
| Highlands Ranch | Colorado | 102,527 | 0.36% | 39 | CDP |
| Lehi | Utah | 101,737 | 4.25% | 40 | City |
| Avondale | Arizona | 100,130 | 1.79% | 41 | City |
| Longmont | Colorado | 100,124 | 0.15% | 42 | City |
| Orem | Utah | 95,755 | -0.46% | 43 | City |
| Queen Creek | Arizona | 95,235 | 6.4% | 44 | Town |
| Santa Fe | New Mexico | 91,957 | 0.77% | 45 | City |
| Sandy | Utah | 90,781 | -1.12% | 46 | City |
| South Jordan | Utah | 90,258 | 2.33% | 47 | City |
| Ogden | Utah | 89,334 | 0.38% | 48 | City |
| Castle Rock | Colorado | 87,875 | 2.72% | 49 | Town |
| Maricopa | Arizona | 85,553 | 5.49% | 50 | City |
| Layton | Utah | 85,495 | 0.68% | 51 | City |
| Loveland | Colorado | 83,465 | 1.44% | 52 | City |
| Broomfield | Colorado | 80,237 | 1.21% | 53 | City |
| Missoula | Montana | 80,103 | 1.2% | 54 | City |
| Caldwell | Idaho | 79,260 | 4.05% | 55 | City |
| Flagstaff | Arizona | 77,763 | 0.14% | 56 | City |
| Casa Grande | Arizona | 76,327 | 5.09% | 57 | City |
| Commerce City | Colorado | 73,973 | 2.58% | 58 | City |
| Grand Junction | Colorado | 72,951 | 1.67% | 59 | City |
| Casas Adobes | Arizona | 71,687 | 0.43% | 60 | CDP |
| Idaho Falls | Idaho | 71,320 | 1.28% | 61 | City |
| Parker | Colorado | 68,783 | 2.47% | 62 | Town |
| Eagle Mountain | Utah | 68,554 | 6.18% | 63 | City |
| Marana | Arizona | 67,257 | 3.76% | 64 | Town |
| Saratoga Springs | Utah | 66,966 | 7.68% | 65 | City |
| Cheyenne | Wyoming | 65,914 | 0.16% | 66 | City |
| Herriman | Utah | 65,423 | 2.4% | 67 | City |
| Millcreek | Utah | 64,487 | 0.21% | 68 | City |
| Bozeman | Montana | 59,908 | 1.71% | 69 | City |
| Lake Havasu City | Arizona | 59,871 | 0.7% | 70 | City |
| Great Falls | Montana | 59,793 | -0.18% | 71 | City |
| Pocatello | Idaho | 59,129 | 0.77% | 72 | City |
| Logan | Utah | 58,720 | 1.69% | 73 | City |
| Casper | Wyoming | 58,577 | -0.21% | 74 | City |
| Coeur d'Alene | Idaho | 58,555 | 1.04% | 75 | City |
| Twin Falls | Idaho | 57,325 | 1.54% | 76 | City |
| Taylorsville | Utah | 56,538 | -1.12% | 77 | City |
| Prescott Valley | Arizona | 53,674 | 2.13% | 78 | Town |
| Catalina Foothills | Arizona | 51,978 | 0.14% | 79 | CDP |
| Murray | Utah | 50,965 | 0.15% | 80 | City |
| Spanish Fork | Utah | 50,334 | 2.57% | 81 | City |
For this list, the Mountain Time Zone Region is defined as the 7 states of Arizona, Colorado, Idaho, Montana, New Mexico, Utah and Wyoming.