Olympia is the capital of the U.S. state of Washington and the county seat of Thurston County. It was incorporated on January 28, 1859. The population was documented as 46,478 in the 2010 census. The city borders Lacey to the east and Tumwater to the south. Olympia is a major cultural center of the Puget Sound region. Olympia is located 60 miles (100 km) southwest of Seattle, the largest city in the state of Washington, and falls within the borders of the Seattle CSA.