Grafton is a village in Ozaukee County, Wisconsin, United States. Located about 20 miles north of Milwaukee and in close proximity to Interstate 43, it is a suburban community in the Milwaukee metropolitan area. The village incorporated in 1896, and at the time of the 2020 census the population was 12,094. Like many of Ozaukee County's cities and villages, the Village of Grafton has rural roots and began as a mill town.