Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Idaho Falls (city), ID | 64,818 |
| 2 | Rexburg (city), ID | 39,409 |
| 3 | Ammon (city), ID | 17,694 |
| 4 | Rigby (city), ID | 5,038 |
| 5 | Shelley (city), ID | 4,785 |
| 6 | Lincoln (CDP), ID | 4,556 |
| 7 | Iona (city), ID | 2,717 |
| 8 | Sugar City (city), ID | 1,715 |
| 9 | Ucon (city), ID | 1,160 |
| 10 | Menan (city), ID | 715 |
| 11 | Ririe (city), ID | 667 |
| 12 | Firth (city), ID | 517 |
| 13 | Roberts (city), ID | 500 |
| 14 | Lewisville (city), ID | 421 |
| 15 | Basalt (city), ID | 357 |
Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Idaho Falls (city), ID | 64,818 |
| 2 | Rexburg (city), ID | 39,409 |
| 3 | Ammon (city), ID | 17,694 |
| 4 | Rigby (city), ID | 5,038 |
| 5 | Shelley (city), ID | 4,785 |
| 6 | Lincoln (CDP), ID | 4,556 |
| 7 | Iona (city), ID | 2,717 |
| 8 | Sugar City (city), ID | 1,715 |
| 9 | Ucon (city), ID | 1,160 |
| 10 | Menan (city), ID | 715 |
| 11 | Ririe (city), ID | 667 |
| 12 | Firth (city), ID | 517 |
| 13 | Roberts (city), ID | 500 |
| 14 | Lewisville (city), ID | 421 |
| 15 | Basalt (city), ID | 357 |