The 2000 Census showed that Washington County had a population of 445,342 people. This represented 13.02% of the total population of Oregon, making it the state's 2nd most populous county (out of 36 counties).
From the Census Estimates for 2009<1>, Washington had a population of 537,318 people. This is an increase of 20.65% since the 2000 Census.
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% | +1.65% since 2006 |
2006 | 510,023 | +14.52% | +2.61% since 2005 |
2005 | 497,073 | +11.62% | +2.44% since 2004 |
2004 | 485,249 | +8.96% | +1.49% since 2003 |
2003 | 478,103 | +7.36% | +1.42% since 2002 |
2002 | 471,401 | +5.85% | +1.97% since 2001 |
2001 | 462,316 | +3.81% | +3.81% since 2000 |
--- | | | 2000 | 445,342 | The Last Census |
Washington County had 178,913 Housing Units<2> at the time of the 2000 Census.
The 2000 Census shows that Washington County has a total area<3> of 726 square miles [1,881 km²]. Of this total, only a minor amount of that area is covered by water (2.63 square miles [6.82 km²]).
Using the above population and land area values, Washington County had a population density of 615 people per square mile [237.6 people/km²], making it the state's 2nd most densely populated county (out of 36 counties).
US Census QuickFacts
The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Washington County is available. The QuickFact also contains a comparison between Washington and the state of Oregon. Click here for the Washington County QuickFact (QF-41067).
Below are some of the communities that are located in Washington County:
Community | Census QuickFact | Population (2009 Est) | Population (2000 Census) | Change in Population |
Hillsboro | QF-4134100 | 95,538 | 70,186 | 36.12% |
Beaverton | QF-4105350 | 93,436 | 76,129 | 22.73% |
Tigard | QF-4173650 | 49,254 | 41,223 | 19.48% |
Forest Grove | QF-4126200 | 21,448 | 17,708 | 21.12% |
Sherwood | QF-4167100 | 17,930 | 11,791 | 52.07% |
Cornelius | QF-4115550 | 11,610 | 9,652 | 20.29% |
Below are the counties that adjoin and form the boundaries of Washington County. A link to their specific Census QuickFact has been provided.
County | Census QuickFact | Direction | Population (2009 Est.) | Population (2000 Census) | Change in Population |
Clackamas | QF-41005 | SE | 386,143 | 338,391 | 14.11% |
Clatsop | QF-41007 | NW | 37,243 | 35,630 | 4.53% |
Columbia | QF-41009 | N | 49,592 | 43,560 | 13.85% |
Multnomah | QF-41051 | E | 726,855 | 660,486 | 10.05% |
Tillamook | QF-41057 | W | 24,889 | 24,262 | 2.58% |
Yamhill | QF-41071 | SW | 99,037 | 84,992 | 16.53% |
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