
Brentwood
- County:
- St. Louis County
- County Seat:
- No
- Area (mi²):
- 1.953
- State:
- Missouri
Brentwood is a city located in St. Louis County, Missouri. Brentwood has a 2025 population of 7,970. Brentwood is currently declining at a rate of -0.62% annually and its population has decreased by -3.03% since the most recent census, which recorded a population of 8,219 in 2020.
The average household income in Brentwood is $122,897 with a poverty rate of 4.86%. The median age in Brentwood is 37.7 years: 35.5 years for males, and 40.2 years for females.