Lacey is a city in Thurston County, Washington, United States. Established as a suburb of Olympia, its population was 42,393 at the 2010 census out of a county population of 252,264.
According to the United States Census Bureau, the city has a total area of 16.51 square miles (42.76 km2), of which, 16.06 square miles (41.60 km2) is land and 0.45 square miles (1.17 km2) is water....
Source: Wikipedia (as of 04/11/2019). Read more from Wikipedia