2 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mountain Home | 1 | 17,331 | 16,073 | 1.23% | 2,393 | 7 | City |
| Glenns Ferry | 2 | 1,290 | 1,284 | 0.08% | 621 | 2 | City |
Mountain Home is the largest city in Elmore County, with a population of 17,331.
Glenns Ferry is the smallest city in Elmore County, with a population of 1,290.
There are 2 cities in Elmore County, Idaho.