| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mountain Home | 1 | 16,961 | 16,051 | 1.08% | 2,342 | 7 | City |
| Glenns Ferry | 2 | 1,254 | 1,280 | -0.16% | 603 | 2 | City |
Mountain Home is the largest city in Elmore County, with a population of 16,961.
Glenns Ferry is the smallest city in Elmore County, with a population of 1,254.
There are 2 cities in Elmore County, Idaho.