Washington County is a district of Oregon.
Boundaries: United States Census Bureau, MAF/TIGER Database (https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html) via geoBoundaries, public domain
| City of Beaverton | no seat recorded | 90 k |
| City of Cornelius | no seat recorded | |
| City of Durham | no seat recorded | |
| City of King City | no seat recorded | 5 k |
| City of Tigard | Tigard | 57 k |
Nothing has been written about Washington County here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
We show Hillsboro as the capital of Washington County. If that is wrong, tell us what it should be and where you read it.
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