
Costa Mesa
- County:
- Orange County
- County Seat:
- No
- Area (mi²):
- 15.806
- State:
- California
Costa Mesa is a city located in Orange County, California. Costa Mesa has a 2025 population of 106,069. Costa Mesa is currently declining at a rate of -1.07% annually and its population has decreased by -5.11% since the most recent census, which recorded a population of 111,781 in 2020.
The average household income in Costa Mesa is $147,350 with a poverty rate of 8.94%. The median age in Costa Mesa is 36.5 years: 36.3 years for males, and 36.6 years for females.