Tacoma is the county seat of Pierce County, Washington, United States. A port city, it is situated along Washington's Puget Sound, 32 miles (51 km) southwest of Seattle, 36 miles (58 km) southwest of Bellevue, 31 miles (50 km) northeast of the state capital, Olympia, 58 miles (93 km) northwest of Mount Rainier National Park, and 80 miles (130 km) east of Olympic National Park. The city's population was 219,346 at the time of the 2020 census. Tacoma is the second-largest city in the Puget Sound area and the third-most populous in the state. Tacoma also serves as the center of business activity for the South Sound region, which has a population of about 1 million.

Pierce County is a county in the U.S. state of Washington. As of the 2020 census, the population was 921,130, up from 795,225 in 2010, making it the second-most populous county in Washington, behind King County, and the 59th-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.