Time Zone: Washington County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.
The community of Hillsboro is the Seat for Washington County.
Washington County is one of the original counties of Oregon and was founded in 1843.
From the Census Estimates for 2009, <1> Washington had a population of 537,318 people. This is an increase of 20.65% since the last Census (which gave a population of 445,342 people in 2000).
At the time of the 2000 Census, Washington represented 13.02% of the total population of Oregon, making it the state's 2nd most populous county (out of 36 counties).
The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.
Year | Population | Change Since 2000 | Year-to-Year Change |
2010 | 529,710 | +18.94% | -1.42% since 2009 |
2009 | 537,318 | +20.65% | +1.93% since 2008 |
2008 | 527,168 | +18.37% | +1.69% since 2007 |
2007 | 518,427 | +16.41% | |
--- | | | 2000 | 445,342 | The Last Census |
More information can be found on the Washington County Census Page for Washington County. .
Below are some of the communities located in Washington County (for more communities, please visit our Nearby Page for Washington County):
Community | 2009 Population | 2000 Population | Change (2009vs. 2000) |
Hillsboro | 95,538 | 70,186 | 36.12% increase |
Beaverton | 93,436 | 76,129 | 22.73% increase |
Tigard | 49,254 | 41,223 | 19.48% increase |
Forest Grove | 21,448 | 17,708 | 21.12% increase |
Sherwood | 17,930 | 11,791 | 52.1% increase |
Websites for Washington County
If you know of a history or genealogy society whose interest includes Washington County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.
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