23 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 97229 | Portland | 75,626 |
| 97124 | Hillsboro | 54,351 |
| 97223 | Portland | 50,226 |
| 97123 | Hillsboro | 48,622 |
| 97007 | Beaverton | 48,081 |
| 97006 | Beaverton | 45,556 |
| 97224 | Portland | 36,015 |
| 97116 | Forest Grove | 29,598 |
| 97008 | Beaverton | 29,183 |
| 97062 | Tualatin | 28,620 |
| 97140 | Sherwood | 27,999 |
| 97005 | Beaverton | 27,812 |
| 97003 | Beaverton | 27,791 |
| 97078 | Beaverton | 25,813 |
| 97225 | Portland | 25,802 |
| 97113 | Cornelius | 15,621 |
| 97133 | North Plains | 5,662 |
| 97119 | Gaston | 5,154 |
| 97106 | Banks | 5,009 |
| 97117 | Gales Creek | 787 |
| 97109 | Buxton | 487 |
| 97144 | Timber | 88 |
| 97125 | Manning | 61 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 23 ZCTAs in Washington County, Oregon (US Census).