Brookfield is a village in Cook County, Illinois, United States.The population was 18,978 at the 2010 census.
Before 1803, the area now called Brookfield was mostly covered by prairie grasses, forests, and farms. Large portions of the area were inhabited by the Native Americans who long ago developed agriculture and corn cultivation, built villages and burial mounds, invented the bow and arrow, and made beautiful pottery.Settlement of the village dates to 1889 when Samuel Eberly Gross, a Chicago lawyer turned real estate investor, began selling building lots plotted from farms and woodlands he had acquired along both sides of the Chicago, Burlington & Quincy Railroad line, which provided passenger and freight service between Chicago and Aurora, Illinois. "Grossdale", as his development was originally called, offered suburban living at prices affordable to working-class families.The name was changed in 1905 after residents became displeased with Gross, whose personal life and fortune had floundered. A contest to choose a new name yielded "Brookfield" in respect for Salt Creek, which runs through the area.