Mountain Brook is a city located in Alabama. With a 2020 population of 20,128, it is the 32nd largest city in Alabama and the 1836th largest city in the United States. Mountain Brook is currently declining at a rate of -0.44% annually and its population has decreased by -1.40% since the most recent census, which recorded a population of 20,413 in 2010. Mountain Brook reached it's highest population of 20,604 in 2000. Spanning over 13 miles, Mountain Brook has a population density of 1,569 people per square mile.
The average household income in Mountain Brook is $214,489 with a poverty rate of 3.67%. The median rental costs in recent years comes to $1,281 per month, and the median house value is $602,200. The median age in Mountain Brook is 40.6 years, 39.8 years for males, and 41.3 years for females. For every 100 females there are 91.2 males.