Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Portland | 1 | 622,882 | 653,344 | -1.21% | 4,666 | 133.5 | City |
| Lake Oswego | 2 | 39,622 | 40,828 | -0.76% | 3,659 | 10.8 | City |
| Oregon City | 3 | 37,211 | 37,769 | -0.38% | 3,703 | 10.0 | City |
| Happy Valley | 4 | 29,865 | 24,041 | 5.13% | 2,575 | 11.6 | City |
| West Linn | 5 | 26,377 | 27,384 | -0.95% | 3,550 | 7.4 | City |
| Wilsonville | 6 | 26,221 | 26,717 | -0.47% | 3,473 | 7.6 | City |
| Milwaukie | 7 | 21,742 | 21,149 | 0.69% | 4,362 | 5.0 | City |
| Canby | 8 | 17,860 | 18,195 | -0.47% | 3,802 | 4.7 | City |
| Oak Grove | 9 | 17,686 | 17,781 | 0.43% | 4,531 | 3.9 | CDP |
| Sandy | 10 | 13,040 | 12,663 | 0.73% | 3,592 | 3.6 | City |
| Oatfield | 11 | 13,016 | 13,588 | -0.21% | 3,834 | 3.4 | CDP |
| Damascus | 12 | 12,314 | 10,973 | 7.69% | 699 | 17.6 | CDP |
| Gladstone | 13 | 11,809 | 12,032 | -0.47% | 4,925 | 2.4 | City |
| Molalla | 14 | 10,056 | 10,243 | -0.46% | 4,055 | 2.5 | City |
| Bull Mountain | 15 | 9,350 | 9,732 | 0.17% | 4,713 | 2.0 | CDP |
| Jennings Lodge | 16 | 7,720 | 8,500 | 0.38% | 4,855 | 1.6 | CDP |
| Estacada | 17 | 5,725 | 4,508 | 5.61% | 2,228 | 2.6 | City |
| Mount Hood Villages | 18 | 5,440 | 4,511 | 7.68% | 242 | 22.4 | CDP |
| Beavercreek | 19 | 4,540 | 4,105 | 0.09% | 226 | 20.1 | CDP |
| Boring | 20 | 2,318 | 1,977 | 7.66% | 538 | 4.3 | CDP |
| Mulino | 21 | 2,220 | 2,178 | 0.41% | 161 | 13.8 | CDP |
| Dunthorpe | 22 | 2,062 | 1,690 | 7.73% | 1,960 | 1.1 | CDP |
| Stafford | 23 | 1,565 | 1,940 | -0.06% | 250 | 6.3 | CDP |
| Orient | 24 | 593 | 774 | 7.82% | 626 | 0.9 | CDP |
| Johnson City | 25 | 544 | 538 | 0.18% | 8,369 | 0.1 | City |
| Rivergrove | 26 | 530 | 542 | -0.56% | 3,064 | 0.2 | City |
| Butteville | 27 | 288 | 317 | 0.35% | 275 | 1.0 | CDP |
| Rhododendron | 28 | 172 | 299 | 8.18% | 44 | 3.9 | CDP |
| Barlow | 29 | 138 | 132 | 0.73% | 2,654 | 0.1 | City |
| Government Camp | 30 | 86 | 96 | -7.53% | 115 | 0.7 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Portland is the largest city in Clackamas County.
Government Camp is the smallest city in Clackamas County.
There are 30 cities in Clackamas County, Oregon.