Colgate is an unincorporated community in Washington County, Wisconsin, United States, straddling the county line with Waukesha County. Colgate is located partially in the village of Richfield, and the village of Lisbon. Its ZIP Code is 53017. The population is around 300, up from about 50 in 1983.

Washington County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 136,761. Its county seat is West Bend. The county was created from Wisconsin Territory in 1836 and organized in 1845. It was named after President George Washington.