Mountain Brook is a city in southeastern Jefferson County, Alabama, and a suburb of Birmingham. According to the 2010 census, the population of the city is 20,413. Mountain Brook is a particularly affluent city within the Birmingham metropolitan area and has appeared in several lists of America's wealthiest communities. Mountain Brook has been listed as one of the 10 wealthiest communities in the United States based on a 2008 survey that calculates wealth above the regular census limit. Mountain Brook is also well known for being the wealthiest city in the state of Alabama.
Mountain Brook was originally developed in 1929 by local developer Robert Jemison as an extensive residential subdivision, and was incorporated on May 24, 1942. The plans, by Boston-based landscape architect Warren H. Manning, called for estate-sized lots along winding scenic roads and denser commercial development centering on three "villages" knowns as English Village, Mountain Brook Village and Crestline Village. Their subdivisions nearby Cherokee Bend, Brookwood Forest, Overton, and Crestline homes in real  nature preserves on the adjacent slopes protected the area from urban encroachment and bridle paths created a recreational network within the development.
Mountain Brook is also the home of the first office park in the nation, built in 1955. This development featured the then novel concepts of ample free parking and low level office buildings with water fountains and landscaped grounds. Mountain Brook built a new city hall, which included a new fire and police station, that was completed in 2013.
Most of the development of Mountain Brook preserved the existing trees. 92.03% of the city is under tree cover, one of the highest ratios in the nation.
Mountain Brook is often referred to as "The Tiny Kingdom" due to its reputation as an enclave for the area's elite and the disparity of wealth between it and City of Birmingham where nearly a quarter of the population lives below the poverty line, according to Census data.