Lacey is a city in Thurston County, Washington, United States. It is a suburb of Olympia with a population of 53,526 at the 2020 census, m…Lacey is a city in Thurston County, Washington, United States. It is a suburb of Olympia with a population of 53,526 at the 2020 census, making it the 24th most populous city in Washington. Lacey is located along Interstate 5 between Olympia and the Nisqually River, which marks the border with Pierce County and Joint Base Lewis–McChord.
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