
Walnut Creek
- County:
- Contra Costa County
- County Seat:
- No
- Area (mi²):
- 19.76
- State:
- California
Walnut Creek is a city located in Contra Costa County, California. Walnut Creek has a 2025 population of 68,456. Walnut Creek is currently declining at a rate of -0.51% annually and its population has decreased by -2.48% since the most recent census, which recorded a population of 70,196 in 2020.
The average household income in Walnut Creek is $179,232 with a poverty rate of 5.95%. The median age in Walnut Creek is 46.1 years: 43.4 years for males, and 49.3 years for females.