15 cities
| City | Rank | County | 2025 Pop. ↓ |
|---|---|---|---|
| Rexburg | 1 | Madison County | 40,927 |
| St. Anthony | 2 | Fremont County | 4,189 |
| Sugar City | 3 | Madison County | 2,560 |
| Victor | 4 | Teton County | 2,510 |
| Driggs | 5 | Teton County | 2,406 |
| Ashton | 6 | Fremont County | 982 |
| Teton | 7 | Fremont County | 864 |
| Dubois | 8 | Clark County | 523 |
| Newdale | 9 | Fremont County | 332 |
| Parker | 10 | Fremont County | 297 |
| Tetonia | 11 | Teton County | 273 |
| Island Park | 12 | Fremont County | 190 |
| Spencer | 13 | Clark County | 31 |
| Drummond | 14 | Fremont County | 15 |
| Warm River | 15 | Fremont County | 1 |
Madison County, Fremont County, Teton County, and Clark County are the counties generally considered part of East Idaho.