Washington County, Oregon

Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 529,710,[1] making it the state's second most populous county.[2] The county seat and largest city is Hillsboro.[2][3]

References
  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on July 22, 2011. Retrieved November 15, 2013.
  2. Proehl, Risa S. (March 2009). "2008 Oregon Population Report" (PDF). Population Research Center. Portland State University. p. 7. Archived from the original (PDF) on March 3, 2016. Retrieved May 5, 2009.
  3. "Find a County". National Association of Counties. Retrieved June 7, 2011.
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