Maple Valley
- County:
- King County
- County Seat:
- No
- Area (mi²):
- 6.004
- State:
- Washington
Maple Valley is a city located in King County, Washington. Maple Valley has a 2026 population of 28,553. Maple Valley is currently growing at a rate of 0.96% annually and its population has increased by 1.66% since the most recent census, which recorded a population of 28,086 in 2020.