There are 11 cities in Washington County, Oregon.
City | Rank | State | 2023 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Hillsboro | 1 | Oregon | 106,058 | 106,922 | -0.27% | 4,128 | 25.69 |
| Beaverton | 2 | Oregon | 99,772 | 97,447 | 0.79% | 5,095 | 19.58 |
| Tigard | 3 | Oregon | 57,344 | 54,995 | 1.4% | 4,497 | 12.75 |
| Forest Grove | 4 | Oregon | 25,943 | 26,162 | -0.28% | 4,432 | 5.85 |
| Sherwood | 5 | Oregon | 19,951 | 20,407 | -0.75% | 4,480 | 4.45 |
| Cornelius | 6 | Oregon | 14,833 | 12,759 | 5.15% | 6,534 | 2.27 |
| King City | 7 | Oregon | 4,982 | 5,168 | -1.21% | 6,083 | 0.82 |
| North Plains | 8 | Oregon | 3,388 | 3,442 | -0.53% | 3,077 | 1.10 |
| Durham | 9 | Oregon | 1,871 | 1,939 | -1.16% | 4,563 | 0.41 |
| Banks | 10 | Oregon | 1,813 | 1,837 | -0.44% | 2,525 | 0.72 |
| Gaston | 11 | Oregon | 670 | 679 | -0.45% | 1,976 | 0.34 |
Hillsboro is the largest city in Washington County.
Gaston is the smallest city in Washington County.
There are 11 cities in Washington County, Oregon.