Pierce County, Washington
Pierce County, Washington | |
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The Old City Hall in Tacoma | |
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Seal | |
Location within the U.S. state of Washington | |
| Coordinates: 47°03′05″N 122°09′12″W / 47.051413°N 122.15324°W | |
| Country | United States |
| State | Washington |
| Founded | December 22, 1852 (created) |
| Named after | Franklin Pierce |
| Seat | Tacoma |
| Largest city | Tacoma |
| Government | |
| • County Executive | Ryan Mello |
| Area | |
• Total | 1,805.491 sq mi (4,676.20 km2) |
| • Land | 1,668.025 sq mi (4,320.16 km2) |
| • Water | 137.466 sq mi (356.04 km2) 7.61% |
| Population (2020) | |
• Total | 921,130 |
• Estimate (2024) | 941,170 |
| • Density | 552.23/sq mi (213.22/km2) |
| Time zone | UTC−8 (Pacific) |
| • Summer (DST) | UTC−7 (PDT) |
| Area code | 253, 360, 564 |
| Congressional districts | 6th, 8th, 10th |
| Website | piercecountywa.gov |
Pierce County is a county in the U.S. state of Washington. As of the 2020 census, the population was 921,130, and was estimated to be 941,170 in 2024, making it the second-most populous county in Washington, behind King County, and the 60th-most populous in the United States. The county seat and largest city is Tacoma, Formed out of Thurston County on December 22, 1852, by the legislature of Oregon Territory, it was named for U.S. President Franklin Pierce. Pierce County is in the Seattle metropolitan area (formally the Seattle-Tacoma-Bellevue, WA, metropolitan statistical area).
Pierce County is home to the volcano Mount Rainier, 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.