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, 31 miles (50 km) northeast of the state capital, Olympia, and 58 miles (93 km) northwest of Mount Rainier 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-largest 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. Tacoma adopted its name after the nearby Mount Rainier. 4K Resolution.