Brookfield (formerly Grossdale) is a village in Cook County, Illinois, United States, located 13 miles (21 km) west of downtown Chicago. Its population was 18,978 at the 2010 census. The city is home to the Brookfield Zoo.
Brookfield is located at 41°49′22″N 87°50′51″W (41.822681, -87.847532).
According to the 2010 census, Brookfield has a total area of 3.067 square miles (7.94 km2), of which 3.06 square miles (7.93 km2) (or 99.77%) is land and 0.007 square miles (0.02 km2) (or 0.23%) is water.
Most of Brookfield is flat land with various small hills and rises. Along Salt Creek is a steep ravine that is home to many oak savannas. These oak savannas are the primary ecosystem of Brookfield, and sprawl out from large, forested areas into small pockets in the village.
As of the census of 2000, there were 19,085 people, 7,536 households, and 5,034 families residing in the village. The population density was 6,252.4 people per square mile (2,416.0/km2). There were 7,753 housing units at an average density of 2,539.9 per square mile (981.5/km2). The racial makeup of the village was 93.53% White, 0.89% African American, 0.14% Native American, 1.24% Asian, 0.01% Pacific Islander, 2.88% from other races, and 1.31% from two or more races.