Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Portland (city), OR | 652,503 |
| 2 | Gresham (city), OR | 114,247 |
| 3 | Beaverton (city), OR | 97,494 |
| 4 | Tigard (city), OR | 54,539 |
| 5 | Aloha (CDP), OR | 53,828 |
| 6 | Lake Oswego (city), OR | 40,731 |
| 7 | Oregon City (city), OR | 37,572 |
| 8 | Bethany (CDP), OR | 31,350 |
| 9 | Tualatin (city), OR | 27,942 |
| 10 | West Linn (city), OR | 27,373 |
| 11 | Wilsonville (city), OR | 26,664 |
| 12 | Happy Valley (city), OR | 23,733 |
| 13 | Milwaukie (city), OR | 21,119 |
| 14 | Sherwood (city), OR | 20,450 |
| 15 | Canby (city), OR | 18,171 |
| 16 | Oak Grove (CDP), OR | 17,290 |
| 17 | Cedar Mill (CDP), OR | 17,259 |
| 18 | Troutdale (city), OR | 16,300 |
| 19 | Oatfield (CDP), OR | 13,977 |
| 20 | Sandy (city), OR | 12,612 |