Greenfield is a city in Milwaukee County, Wisconsin, United States.

Greenfield is one of many bedroom communities in the Milwaukee metropolitan area.

[6][failed verification] This was done to prevent total annexation by the City of Milwaukee.

There were 17,790 housing units at an average density of 1,545.6 per square mile (596.8/km2).

37.5% of all households were made up of individuals, and 16.5% had someone living alone who was 65 years of age or older.

There were 16,203 housing units at an average density of 1,403.3 per square mile (541.6/km2).

34.6% of all households were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older.

The Milwaukee Electric Railway & Light interurban served Greenfield at Greenwood Junction.