23 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 97229 | Portland | 74,755 |
| 97124 | Hillsboro | 54,493 |
| 97223 | Portland | 50,027 |
| 97007 | Beaverton | 48,524 |
| 97123 | Hillsboro | 48,218 |
| 97006 | Beaverton | 45,090 |
| 97224 | Portland | 36,591 |
| 97008 | Beaverton | 29,832 |
| 97116 | Forest Grove | 29,182 |
| 97062 | Tualatin | 28,845 |
| 97003 | Beaverton | 28,639 |
| 97140 | Sherwood | 28,438 |
| 97005 | Beaverton | 27,543 |
| 97225 | Portland | 26,139 |
| 97078 | Beaverton | 24,790 |
| 97113 | Cornelius | 14,984 |
| 97133 | North Plains | 5,708 |
| 97119 | Gaston | 5,398 |
| 97106 | Banks | 4,770 |
| 97117 | Gales Creek | 866 |
| 97109 | Buxton | 553 |
| 97144 | Timber | 111 |
| 97125 | Manning | 88 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 23 ZCTAs in Washington County, Oregon (US Census).