
Mountain Brook
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 12.841
- State:
- Alabama
Mountain Brook is a city located in Jefferson County, Alabama. Mountain Brook has a 2025 population of 21,223. Mountain Brook is currently declining at a rate of -1.2% annually and its population has decreased by -5.71% since the most recent census, which recorded a population of 22,508 in 2020.
The average household income in Mountain Brook is $302,510 with a poverty rate of 2.71%. The median age in Mountain Brook is 41.5 years: 40.6 years for males, and 42.6 years for females.