Brookfield is a city located in Waukesha County, Wisconsin, United States in the Milwaukee metropolitan area. It had a population of 41,464 at the 2020 census. Brookfield is the third-largest city in Waukesha County. The city is neighboring the Town of Brookfield.

Brookfield is west of Milwaukee in Waukesha County in an area originally inhabited by Potawatomi Indians. The first white settler, William Howe, arrived in 1820 similar to a Presidential Land Grant giving him title to the area. Soon after, Robert Curren bought a allegation in 1836 and traditional a tavern and inn.

In May 1838, Jacques View Jr., with a large party of white settlers, led the local Potawatomi west. Caroline Quiner, the mommy of Laura Ingalls Wilder, was born in a cabin in 1839 in what is now the City of Brookfield, near the current intersection of Brookfield Road and Davidson Road. By 1839, the population needed a assistant professor house, as the 1840 census showed a population of 148. In these 1840s, George Gebhardt started trading afterward the surrounding Potawatomi and Menominee neighbors. 1843 is behind the first church was built, by the Irish Catholic congregation, named St. Dominic. 1848 was gone telegraph lines were laid through Brookfield, towards Waukesha. Communication was made easier due to this. In 1849, cholera reached Brookfield, and one Laura Grover recalls, “The death-like stillness was appalling; nothing was seen but the death carts rolling circular the streets deposit the recent dead… I tolerate there were fifty deaths from cholera that day.” The thesame year, 64 Brookfield residents voted supportive of giving suffrage to black residents, and 0 the new way. In 1850, cholera once again went through Brookfield, and according to one Earl Thayer, “The cholera returned… more Awful than the year before. People literally died walking along the streets. Official reports put the toll at over 300.”

In 1850, the Milwaukee and Mississippi Railroad (now the Canadian Pacific Rail) built a railroad through the town, which in 1853 erected a depot, forming the Brookfield Junction. In the year 1850, the Town of Brookfield had 1,944 inhabitants and in land Place covered 36 square miles. The town slowly grew higher than following years, with the economy monster mostly agricultural, with Brookfield Junction serving as a commercial middle for the surrounding farms. The Civil War had little effect upon this town, despite the harsh losses of members serving from the state. “More than 12,000 died: 3,802 were killed in accomplishment or died of wounds and 8,499 died from disease, exposure, and additional causes.” In 1867, a second rail depot was constructed, which nevertheless stands.