1961–1979[]
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LOGO MISSING |
1979–2006[]
2006–present[]
Municipalities of Washington County, Oregon
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|---|
| Banks | Beaverton | Cornelius | Durham | Forest Grove | Gaston | Hillsboro | King City | Lake Oswego (part) | North Plains | Portland (part) | Rivergrove (part) | Sherwood | Tigard | Tualatin (part) | Wilsonville (part) |