13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Delta | 1 | 3,786 | 3,640 | 0.77% | 440 | 9 | City |
| Fillmore | 2 | 2,709 | 2,614 | 0.71% | 379 | 7 | City |
| Hinckley | 3 | 660 | 617 | 1.38% | 132 | 5 | Town |
| Oak City | 4 | 649 | 613 | 1.09% | 557 | 1 | Town |
| Kanosh | 5 | 515 | 509 | 0.19% | 667 | 1 | Town |
| Holden | 6 | 467 | 457 | 0.43% | 797 | 1 | Town |
| Deseret | 7 | 446 | 249 | 1.59% | 145 | 3 | CDP |
| Scipio | 8 | 378 | 355 | 1.34% | 365 | 1 | Town |
| Meadow | 9 | 356 | 335 | 1.14% | 695 | 1 | Town |
| Leamington | 10 | 281 | 263 | 1.44% | 180 | 2 | Town |
| Sutherland | 11 | 190 | 38 | 1.06% | 88 | 2 | CDP |
| Lynndyl | 12 | 131 | 116 | 2.34% | 41 | 3 | Town |
| Oasis | 13 | 38 | 29 | 8.57% | 99 | 0 | CDP |
Delta is the largest city in Millard County, with a population of 3,786.
Oasis is the smallest city in Millard County, with a population of 38.
There are 13 cities in Millard County, Utah.