Ozaukee County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 86,395. Its county seat is Port Washington, making it one of three Wisconsin counties on Lake Michigan not to have a county seat with the same name.
Mequon is the largest city in Ozaukee County, in the U.S. state of Wisconsin, and the third-largest city in Wisconsin by land area. Located on Lake Michigan's western shore with significant commercial developments along Interstate 43, the community is a suburb in the Milwaukee metropolitan area. Despite being an incorporated city, approximately half of Mequon's land is undeveloped and agriculture plays a significant role in the local economy. At the time of the 2010 census the population was 23,132.
Thiensville is a village in Ozaukee County, Wisconsin, United States. Located on the west bank of a bend in the Milwaukee River, the community is bordered on all sides by the City of Mequon and is a suburb in the Milwaukee metropolitan area. The population was 3,235 at the 2010 census.
Erin is a town in Washington County, Wisconsin, United States. The population was 3,664 at the 2000 census. The unincorporated community of Thompson is located in Erin. The unincorporated community of Hubertus is also located partially in the town.
Belgium is a town in Ozaukee County, Wisconsin, United States. The population was 1,513 at the 2000 census. The Village of Belgium is surrounded on all sides by the town, and the unincorporated communities of Decker, Holy Cross, Lake Church, and Sauk Trail Beach are located in the town, as is the ghost town of Stonehaven. The unincorporated community of Dacada is also partially located in the town. The ghost town of Stonehaven is also located in the town.
Belgium is a village in Ozaukee County, Wisconsin, United States. Located along Interstate 43, the village is one of the northernmost communities in the Milwaukee metropolitan area. The population was 2,245 at the 2010 census.
Cedarburg is a city in Ozaukee County, Wisconsin, United States. Located about 20 miles (32 km) north of Milwaukee and in close proximity to Interstate 43, it is a suburban community in the Milwaukee metropolitan area. The city incorporated in 1885, and at the time of the 2010 census the population was 11,412.
Fredonia is a village in Ozaukee County, Wisconsin, United States. Located on the Milwaukee River, the village is in the Milwaukee metropolitan area. The population was 2,160 at the 2010 census.
Fredonia is a town in Ozaukee County, Wisconsin, United States. The population was 2,903 at the 2000 census. The Village of Fredonia is surrounded by the town. The unincorporated communities of Little Kohler and Waubeka are also located in the town.
Grafton is a town in Ozaukee County, Wisconsin, United States, and is in the Milwaukee metropolitan area. The town was created in 1846 and at the time of the 2010 census had a population of 4,053.
Port Washington is a town in Ozaukee County in the U.S. state of Wisconsin. It surrounds the northern and western side of the city of Port Washington. As of the 2000 census, the town population was 1,631. The unincorporated communities of Druecker and Knellsville are also located in the town.
Port Washington is the county seat of Ozaukee County in the U.S. state of Wisconsin. Located on Lake Michigan's western shore east of Interstate 43, the community is a suburb in the Milwaukee metropolitan area 27 miles north of the City of Milwaukee. The city's artificial harbor at the mouth of Sauk Creek was dredged in the 1870s and was a commercial port until the early 2000s. The population was 11,250 at the 2010 census.
Saukville is a village in Ozaukee County, Wisconsin, United States. Located on the Milwaukee River with a district along Interstate 43, the community is a suburb in the Milwaukee metropolitan area. The population was 4,451 at the 2010 census.
Lake Church is an unincorporated community located in the town of Belgium, Ozaukee County, Wisconsin, United States. Lake Church is east of Belgium and is near Interstate 43.
Dacada is an unincorporated community located in the towns of Belgium and Holland in Ozaukee and Sheboygan counties, Wisconsin, United States. Dacada is east of Random Lake and northwest of Belgium.
Knellsville is an unincorporated community in the Town of Port Washington, Ozaukee County, Wisconsin, United States. Located on the north side of the intersection of Interstate 43 and Wisconsin Highway 32, Knellsville borders the City of Port Washington's northern municipal limit. The Port Washington Town Hall is in Knellsville, but the City of Port Washington provides sewerage and water services for the community.
Lakefield is an unincorporated community located in the Town of Grafton in Ozaukee County, Wisconsin, United States. Lakefield is located at the intersection of County T and County W.
Little Kohler, or Kohler, is an unincorporated community located in the Town of Fredonia in Ozaukee County, Wisconsin, United States.
Hamilton is an unincorporated community located in the Town of Cedarburg, Ozaukee County, Wisconsin, United States. Much of the community is part of the Hamilton Historic District, a site listed on the National Register of Historic Places. The NRHP-listed Concordia Mill is also located in the community.
Druecker is an unincorporated community in the Town of Port Washington, Ozaukee County, Wisconsin, United States. The community is located on the east bank of Sauk Creek, and the Union Pacific railroad operates tracks passing through Druecker.
United States 
Wisconsin 
