Clark County is a county in the southwestern part of the U.S. state of Washington, and the southernmost county in Washington. As of the 2010 census, the population was 425,363, making it Washington's fifth-most populous county. Its county seat and largest city is Vancouver. It was the first county in Washington, named after William Clark of the Lewis and Clark Expedition. It was created by the provisional government of Oregon Territory on August 20, 1845, and at that time covered the entire present-day state.
Clark County is the third most populous county in the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area, and is located across the Columbia River from Portland.
Clark County began as the District of Vancouver on July 27, 1844. It included all the land north of the Columbia River, west of the Rocky Mountains, and south of Alaska. In 1845 the provisional government changed its name to Vancouver County. At that time it stretched from the Columbia River to 54 degrees 40 minutes North Latitude in what is now British Columbia. On June 15, 1846 the United States Senate approved the present boundary between the U.S. and Canada at the 49th Parallel.
As of the 2010 United States Census, there were 425,363 people, 158,099 households, and 110,672 families residing in the county. The population density was 676.2 inhabitants per square mile (261.1/km²). There were 167,413 housing units at an average density of 266.2 per square mile (102.8/km²). The racial makeup of the county was 85.4% white, 4.1% Asian, 2.0% black or African American, 0.9% American Indian, 0.6% Pacific islander, 2.9% from other races, and 4.0% from two or more races. Those of Hispanic or Latino origin made up 7.6% of the population. In terms of ancestry, 24.4% were German, 13.1% were Irish, 13.1% were English, 5.7% were Norwegian, and 4.3% were American.
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