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  1. Washington County is one of 36 counties in the U.S. state of Oregon and part of the Portland metropolitan area. The 2020 census recorded the population as 600,372, making it the second most populous county in the state and most populous "Washington County" in the United States.

  2. Washington County: 067: Hillsboro: 1843: One of the original four districts of the Oregon Country (as Twality District) Named in honor of George Washington (1732-1799), the first President of the United States. 598,865: 724 sq mi (1,875 km 2) Wheeler County: 069: Fossil: 1899: Grant County, Gilliam County, and Crook County

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  3. Washington County is one of 36 counties in the U.S. state of Oregon and part of the Portland metropolitan area. The 2020 census recorded the population as 600,372, making it the second most populous county in the state and most populous "Washington County" in the United States.

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  5. Washington County is one of 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 600,372, [1] making it the state's second most populous county. [2] The county seat and largest city is Hillsboro. [2] [3]

  6. The official website for Washington County, Oregon. ... 2024, Primary Election have been mailed to registered voters in Washington County. Questions? Contact us at ...

  7. The Washington County Courthouse in Hillsboro, Oregon is the courthouse for Washington County, Oregon, in the United States. Washington County was established in 1843 and the first government building was finished in 1852.

  8. Washington County obtained its present boundaries in 1854 with the creation of Columbia County to the north and Multnomah County to the east. The area of Washington County is 727 square miles. Columbia was selected as the county seat in 1850. Later, the town was given the name of Hillsborough, which in 1858 was modified to Hillsboro.

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