Lacey
- County:
- Thurston County
- County Seat:
- No
- Area (mi²):
- 18.955
- State:
- Washington
Lacey is a city located in Thurston County, Washington. Lacey has a 2026 population of 58,644. Lacey is currently growing at a rate of 0.7% annually and its population has increased by 3.31% since the most recent census, which recorded a population of 56,764 in 2020.