4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mountain Home | 1 | 17,121 | 16,073 | 1.24% | 2,431 | 7 | City |
| Mountain Home AFB | 2 | 3,170 | 3,151 | -0.16% | 318 | 10 | CDP |
| Glenns Ferry | 3 | 1,289 | 1,284 | 0.08% | 620 | 2 | City |
| Hammett | 4 | 316 | 212 | 7.12% | 269 | 1 | CDP |
Mountain Home is the largest city in Elmore County, with a population of 17,121.
Hammett is the smallest city in Elmore County, with a population of 316.
There are 4 cities in Elmore County, Idaho.