Ozaukee County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 91,503. 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. Ozaukee County is included in the Milwaukee–Waukesha–West Allis, WI Metropolitan Statistical Area.
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.
Cedarburg is a town in Ozaukee County, Wisconsin, United States, and is in the Milwaukee metropolitan area. The town was created in 1849 and at the time of the 2020 census had a population of 6,162.
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 2020 census the population was 12,121.
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.
The Town of Grafton is a town located 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 2020 Census had a population of 4,157.
Grafton is a village 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 village incorporated in 1896, and at the time of the 2010 census the population was 11,459.
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.
Saukville is a town in Ozaukee County, Wisconsin, United States. The Village of Saukville is located in the town's southeast quadrant. The population was 1,755 at the 2000 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.
West Bend is a town in Washington County, Wisconsin, United States. The population was 4,834 at the 2000 census. The City of West Bend is located partially within the town. The unincorporated community of Nabob is located in the town.
This is a list of the National Register of Historic Places listings in Ozaukee County, Wisconsin. It is intended to provide a comprehensive listing of entries in the National Register of Historic Places that are located in Ozaukee County, Wisconsin. The locations of National Register properties for which the latitude and longitude coordinates are included below may be seen in a map.
Washington Avenue Historic District is the historic center of Cedarburg, Wisconsin, the location of the early industry and commerce that was key to the community's development. The historic district was listed on the National Register of Historic Places (NRHP) in 1986.
The Cedarburg Mill is a former gristmill in Cedarburg, Wisconsin that is listed on the U.S. National Register of Historic Places. Located the on Cedar Creek, the building was constructed in 1855 by Frederick Hilgen and William Schroeder to replace a smaller wooden mill from the 1840s. At the time of its construction, the five-story structure was the tallest building in Cedarburg.
The Covered Bridge in Cedarburg, Ozaukee County, Wisconsin, United States, is one of the last remaining covered bridges in that state, which once had about 40 covered bridges. Built in 1876 to cross Cedar Creek, the bridge is 120 feet (37 m) long and is made of pine with oak lattices. It was listed on the National Register of Historic Places in 1973 and is now used only for pedestrian traffic.
The Concordia Mill is a former gristmill on Cedar Creek located in Hamilton, Wisconsin, United States. The limestone mill was built in 1853 by Edward H. Janssen and his brother, Theodore, along with a Mr. Gaitsch with locally quarried limestone. In 1881, the mill's dam washed out during heavy spring flooding and was rebuilt sometime later. The mill operated until World War II when it was converted into a distillery that operated for several years. On April 26, 1974, it was added to the National Register of Historic Places, and the surrounding area, known as the Hamilton Historic District was added to the NRHP two years later.
The Old Ozaukee County Courthouse in Port Washington, Wisconsin is a Richardsonian Romanesque-styled building built in 1901 and clad in gray-blue limestone from the nearby Cedarburg quarry. It was added to the National Register of Historic Places in 1976. The building currently serves as the county administration center.
The Port Washington Downtown Historic District is the largely intact remainder of the old commercial downtown of Port Washington, Wisconsin, United States. It consists of about 40 contributing buildings built from the 1850s to the 1950s in various styles. The district was added to the National Register of Historic Places in 2000 for significance to both architecture and the history of commerce.
The Columbia Historic District is a neighborhood in Cedarburg, Wisconsin, that is listed on the National Register of Historic Places. At the time the district was listed on the register, its contributing properties included 128 historic homes, one church, and eighty-seven historic outbuildings, including garages and barns, all constructed between 1844 and 1938. The district also contained several dozen buildings that do not contribute to the historic district, including modern homes from the post-war era as well as modern garages and other additions to historic properties.
United States 
Wisconsin 
