17 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Brigham City | 1 | 20,637 | 19,683 | 0.78% | 826 | 25 | City |
| Tremonton | 2 | 14,031 | 9,968 | 5.07% | 1,686 | 8 | City |
| Perry | 3 | 6,372 | 5,589 | 2.1% | 797 | 8 | City |
| Erda | 4 | 4,265 | 3,574 | 2.77% | 106 | 40 | City |
| Garland | 5 | 2,862 | 2,592 | 1.6% | 1,550 | 2 | City |
| Willard | 6 | 2,531 | 2,003 | 3.6% | 417 | 6 | City |
| Honeyville | 7 | 1,866 | 1,616 | 2.3% | 159 | 12 | City |
| Mantua | 8 | 1,475 | 1,112 | 4.31% | 302 | 5 | Town |
| Elwood | 9 | 1,408 | 1,182 | 2.77% | 165 | 9 | Town |
| Bear River City | 10 | 913 | 877 | 0.66% | 508 | 2 | City |
| Corinne | 11 | 906 | 825 | 1.57% | 239 | 4 | City |
| Fielding | 12 | 667 | 558 | 2.77% | 1,268 | 1 | Town |
| Plymouth | 13 | 524 | 427 | 3.15% | 601 | 1 | Town |
| Deweyville | 14 | 472 | 420 | 1.94% | 74 | 6 | Town |
| Portage | 15 | 299 | 277 | 1.36% | 117 | 3 | Town |
| Howell | 16 | 237 | 237 | 0% | 7 | 35 | Town |
| Snowville | 17 | 165 | 162 | 0.61% | 106 | 2 | Town |
Brigham City is the largest city in Box Elder County, with a population of 20,637.
Snowville is the smallest city in Box Elder County, with a population of 165.
There are 17 cities in Box Elder County, Utah.