Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Portland (city), OR | 652,503 |
| 2 | Gresham (city), OR | 114,247 |
| 3 | Happy Valley (city), OR | 23,733 |
| 4 | Milwaukie (city), OR | 21,119 |
| 5 | Troutdale (city), OR | 16,300 |
| 6 | Oatfield (CDP), OR | 13,977 |
| 7 | Sandy (city), OR | 12,612 |
| 8 | Gladstone (city), OR | 12,017 |
| 9 | Damascus (CDP), OR | 11,050 |
| 10 | Fairview (city), OR | 10,424 |
| 11 | Jennings Lodge (CDP), OR | 7,503 |
| 12 | West Slope (CDP), OR | 7,223 |
| 13 | Raleigh Hills (CDP), OR | 6,196 |
| 14 | Wood Village (city), OR | 4,387 |
| 15 | Estacada (city), OR | 4,356 |
| 16 | Boring (CDP), OR | 1,931 |
| 17 | Dunthorpe (CDP), OR | 1,704 |
| 18 | Maywood Park (city), OR | 829 |
| 19 | Johnson City (city), OR | 539 |
| 20 | Orient (CDP), OR | 462 |