Pierce County, Washington

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Pierce County is the second most populous county in the U.S. state of Washington. Formed out of Thurston County on December 22, 1852, by the legislature of Oregon Territory[1][2] , it was named for U.S. President Franklin Pierce. As of 2009, the population was 796,836. The county seat is Tacoma, on Commencement Bay, which is also the county's largest city.

Pierce County is notable for being home to the Mount Rainier volcano, the tallest mountain in the Cascade Range. Its most recent recorded eruption was between 1820 and 1854. There is no imminent risk of eruption, but geologists expect that the volcano will erupt again. If this should happen, parts of Pierce County and the Puyallup Valley would be at risk from lahars, lava, or pyroclastic flows. The Mount Rainier Volcano Lahar Warning System was established in 1998 to assist in the evacuation of the Puyallup River valley in case of eruption.

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Geography

According to the U.S. Census Bureau, the county has a total area of 1,806 square miles (4,679 km²), of which 1,679 square miles (4,348 km²) is land and 128 square miles (330 km²) (7.06%) is water. The highest natural point in Washington, Mount Rainier at 14,410 feet (4,392 m), is located in Pierce County.

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