Centralia
- County:
- Lewis County
- County Seat:
- No
- Area (mi²):
- 7.81
- State:
- Washington
Centralia is a city located in Lewis County, Washington. Centralia has a 2026 population of 19,061. Centralia is currently growing at a rate of 0.37% annually and its population has increased by 3.61% since the most recent census, which recorded a population of 18,397 in 2020.