Identifiers: city · town · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | La Grande (city), OR | 13,026 |
| 2 | Union (city), OR | 2,152 |
| 3 | Elgin (city), OR | 1,717 |
| 4 | Island City (city), OR | 1,144 |
| 5 | Cove (city), OR | 620 |
| 6 | North Powder (city), OR | 504 |
| 7 | Imbler (city), OR | 245 |
| 8 | Summerville (town), OR | 119 |
| 9 | Meacham (CDP), OR | 85 |