23 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 97229 | Portland | 76,106 |
| 97124 | Hillsboro | 54,357 |
| 97223 | Portland | 50,527 |
| 97123 | Hillsboro | 48,410 |
| 97007 | Beaverton | 47,895 |
| 97006 | Beaverton | 46,463 |
| 97224 | Portland | 36,569 |
| 97116 | Forest Grove | 29,800 |
| 97062 | Tualatin | 28,930 |
| 97008 | Beaverton | 28,611 |
| 97005 | Beaverton | 28,311 |
| 97140 | Sherwood | 27,933 |
| 97003 | Beaverton | 27,811 |
| 97225 | Portland | 25,869 |
| 97078 | Beaverton | 25,662 |
| 97113 | Cornelius | 16,268 |
| 97133 | North Plains | 5,416 |
| 97119 | Gaston | 5,233 |
| 97106 | Banks | 4,855 |
| 97117 | Gales Creek | 982 |
| 97109 | Buxton | 730 |
| 97125 | Manning | 248 |
| 97144 | Timber | 66 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 23 ZCTAs in Washington County, Oregon (US Census).