Cedarburg is a city in Ozaukee County, Wisconsin, United States. Located about 20 miles north of Milwaukee and in close proximity to Interstate 43, it is a suburb in the Milwaukee metropolitan area. The city incorporated in 1885, and at the time of the 2020 census the population was 12,121. Like many of Ozaukee County's cities and villages, the City of Cedarburg began as a mill town. German immigrants began building hydropowered gristmills and woolen mills along Cedar Creek in the 1840s.