|Thurston County Washington Cities/Towns - Bucoda, Grand Mound, Lacey, Nisqually Indian Community, North Yelm, Olympia (County Seat), Rainier, Rochester, Tanglewide-Thompson Place, Tenino, Tumwater, Yelm
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Thurston County is a county located in the U.S. state of Washington. On July 1, 2016, the population was 275,222. The county seat is at Olympia.
It is named after Samuel R. Thurston, the Oregon Territory's first delegate to Congress. Thurston County was created out of Lewis County by the government of Oregon Territory on January 12, 1852.