4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mountain Home | 1 | 17,139 | 16,048 | 1.29% | 2,433 | 7.04 | City |
| Mountain Home AFB | 2 | 3,170 | 3,151 | -0.16% | 318 | 9.97 | CDP |
| Glenns Ferry | 3 | 1,318 | 1,283 | 0.53% | 634 | 2.08 | City |
| Hammett | 4 | 316 | 212 | 7.12% | 269 | 1.18 | CDP |
Mountain Home is the largest city in Elmore County, with a population of 17,139.
Hammett is the smallest city in Elmore County.
There are 4 cities in Elmore County, Idaho.