15 cities
| City | Rank | County | 2025 Pop. ↓ |
|---|---|---|---|
| Rexburg | 1 | Madison County | 40,344 |
| St. Anthony | 2 | Fremont County | 4,236 |
| Driggs | 3 | Teton County | 2,439 |
| Sugar City | 4 | Madison County | 2,372 |
| Victor | 5 | Teton County | 2,361 |
| Ashton | 6 | Fremont County | 951 |
| Teton | 7 | Fremont County | 872 |
| Dubois | 8 | Clark County | 525 |
| Newdale | 9 | Fremont County | 332 |
| Parker | 10 | Fremont County | 296 |
| Tetonia | 11 | Teton County | 271 |
| Island Park | 12 | Fremont County | 192 |
| Spencer | 13 | Clark County | 29 |
| Drummond | 14 | Fremont County | 15 |
| Warm River | 15 | Fremont County | 0 |
Madison County, Fremont County, Teton County, and Clark County are the counties generally considered part of East Idaho.