76 cities
| City | State | 2025 Pop. ↓ | Annual Change | Rank | Type |
|---|---|---|---|---|---|
| Phoenix | Arizona | 1,688,306 | 0.9% | 1 | City |
| Denver | Colorado | 731,868 | 0.39% | 2 | City |
| Albuquerque | New Mexico | 559,186 | -0.2% | 3 | City |
| Tucson | Arizona | 556,854 | 0.51% | 4 | City |
| Mesa | Arizona | 519,951 | 0.54% | 5 | City |
| Colorado Springs | Colorado | 496,514 | 0.6% | 6 | City |
| Aurora | Colorado | 407,211 | 1.01% | 7 | City |
| Gilbert | Arizona | 293,630 | 1.68% | 8 | Town |
| Chandler | Arizona | 282,181 | 0.34% | 9 | City |
| Glendale | Arizona | 260,444 | 0.89% | 10 | City |
| Scottsdale | Arizona | 247,245 | 0.44% | 11 | City |
| Boise City | Idaho | 238,443 | 0.2% | 12 | City |
| Salt Lake City | Utah | 222,062 | 1.96% | 13 | City |
| Peoria | Arizona | 201,907 | 0.99% | 14 | City |
| Tempe | Arizona | 191,314 | 0.63% | 15 | City |
| Surprise | Arizona | 173,356 | 3.46% | 16 | City |
| Fort Collins | Colorado | 171,157 | 0.14% | 17 | City |
| Lakewood | Colorado | 157,014 | 0.09% | 18 | City |
| Thornton | Colorado | 147,813 | 0.77% | 19 | City |
| Meridian | Idaho | 144,801 | 3.62% | 20 | City |
| West Valley City | Utah | 137,681 | -0.34% | 21 | City |
| Goodyear | Arizona | 123,279 | 4.31% | 22 | City |
| Billings | Montana | 122,545 | 0.87% | 23 | City |
| Nampa | Idaho | 121,330 | 3.39% | 24 | City |
| Arvada | Colorado | 121,250 | -0.51% | 25 | City |
| Buckeye | Arizona | 119,482 | 4.5% | 26 | City |
| Las Cruces | New Mexico | 118,317 | 1.13% | 27 | City |
| West Jordan | Utah | 116,601 | -0.07% | 28 | City |
| Greeley | Colorado | 115,631 | 1.11% | 29 | City |
| Provo | Utah | 115,572 | 0.08% | 30 | City |
| Westminster | Colorado | 114,964 | -0.29% | 31 | City |
| Rio Rancho | New Mexico | 114,544 | 1.8% | 32 | City |
| Pueblo | Colorado | 110,980 | -0.17% | 33 | City |
| Centennial | Colorado | 109,015 | 0.15% | 34 | City |
| St. George | Utah | 108,847 | 2.41% | 35 | City |
| Boulder | Colorado | 106,399 | -0.38% | 36 | City |
| Yuma | Arizona | 105,113 | 1.5% | 37 | City |
| Longmont | Colorado | 99,971 | 0.15% | 38 | City |
| Avondale | Arizona | 98,369 | 1.82% | 39 | City |
| Lehi | Utah | 97,591 | 4.44% | 40 | City |
| Orem | Utah | 96,200 | -0.46% | 41 | City |
| Sandy | Utah | 91,810 | -1.11% | 42 | City |
| Santa Fe | New Mexico | 91,254 | 0.78% | 43 | City |
| Queen Creek | Arizona | 89,508 | 6.84% | 44 | Town |
| Ogden | Utah | 88,995 | 0.38% | 45 | City |
| South Jordan | Utah | 88,207 | 2.38% | 46 | City |
| Castle Rock | Colorado | 85,544 | 2.8% | 47 | Town |
| Layton | Utah | 84,921 | 0.68% | 48 | City |
| Loveland | Colorado | 82,283 | 1.46% | 49 | City |
| Maricopa | Arizona | 81,103 | 5.8% | 50 | City |
| Broomfield | Colorado | 79,280 | 1.22% | 51 | City |
| Missoula | Montana | 79,153 | 1.21% | 52 | City |
| Flagstaff | Arizona | 77,651 | 0.14% | 53 | City |
| Caldwell | Idaho | 76,174 | 4.22% | 54 | City |
| Casa Grande | Arizona | 72,627 | 5.37% | 55 | City |
| Commerce City | Colorado | 72,109 | 2.65% | 56 | City |
| Grand Junction | Colorado | 71,752 | 1.7% | 57 | City |
| Idaho Falls | Idaho | 70,421 | 1.29% | 58 | City |
| Parker | Colorado | 67,128 | 2.53% | 59 | Town |
| Cheyenne | Wyoming | 65,809 | 0.16% | 60 | City |
| Marana | Arizona | 64,818 | 3.91% | 61 | Town |
| Eagle Mountain | Utah | 64,564 | 6.59% | 62 | City |
| Millcreek | Utah | 64,352 | 0.21% | 63 | City |
| Herriman | Utah | 63,887 | 2.46% | 64 | City |
| Saratoga Springs | Utah | 62,188 | 8.32% | 65 | City |
| Great Falls | Montana | 59,903 | -0.18% | 66 | City |
| Lake Havasu City | Arizona | 59,454 | 0.71% | 67 | City |
| Bozeman | Montana | 58,901 | 1.74% | 68 | City |
| Casper | Wyoming | 58,700 | -0.21% | 69 | City |
| Pocatello | Idaho | 58,680 | 0.77% | 70 | City |
| Coeur d'Alene | Idaho | 57,955 | 1.05% | 71 | City |
| Logan | Utah | 57,745 | 1.72% | 72 | City |
| Taylorsville | Utah | 57,178 | -1.11% | 73 | City |
| Twin Falls | Idaho | 56,457 | 1.56% | 74 | City |
| Prescott Valley | Arizona | 52,557 | 2.17% | 75 | Town |
| Murray | Utah | 50,891 | 0.15% | 76 | 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.