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Pierce County, Washington

US county information
NamePierce County
StateWashington
SeatTacoma
Largest cityTacoma
US Area
Total Area1806 sq mi (4677.5 km2)
Land Area1679 sq mi (4348.6 km2)
Water Area128 sq mi (331.5 km2)
Population795225 (2010)
Density182.8/km2 (473.5/sq mi)
FoundedDecember 22, 1852

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rightPierce 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

, it was named for U.S. President Franklin Pierce.

As of 2010 Census, the population was 795,225. 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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