Ozaukee County, Wisconsin

Coordinates: 43°23′55″N 87°53′37″W / 43.398475°N 87.893572°W / 43.398475; -87.893572
From Wikipedia, the free encyclopedia

Ozaukee County
Ozaukee County Courthouse in July 2009
Ozaukee County Courthouse in July 2009
Map of Wisconsin highlighting Ozaukee County
Location within the U.S. state of Wisconsin
Map of the United States highlighting Wisconsin
Wisconsin's location within the U.S.
Coordinates: 43°23′55″N 87°53′37″W / 43.3985°N 87.8936°W / 43.3985; -87.8936
Country United States
State Wisconsin
SeatPort Washington
Largest cityMequon
 • Total1,116.2 sq mi (2,891 km2)
 • Land233.08 sq mi (603.7 km2)
 • Water883.12 sq mi (2,287.3 km2)
 • Total91,503
 • Density392.7/sq mi (151.6/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district6th

Ozaukee County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 91,503.[1] Its county seat is Port Washington.[2] Ozaukee County is included in the MilwaukeeWaukeshaWest Allis, WI Metropolitan Statistical Area.

As of the 2000 Census, Ozaukee County had the second-lowest poverty rate of any county in the United States, at 2.6%. In terms of per capita income, it is the 25th-wealthiest county in the country. Bolstered by low crime rates and school districts with high graduation rates, Forbes magazine ranked Ozaukee County #2 on its list of "America's Best Places To Raise A Family" in June 2008.[3]


"Ozaukee" comes from the Ojibwe name for the Sauk people. It probably means "people living at the mouth of a river."[4]



The Hilgen Spring Mound Site is one of the oldest-known sites of human habitation of Ozaukee County. Located near Cedar Creek in the eastern part of the City of Cedarburg, the site consists of three conical burial mounds constructed by early Woodland period Mound Builders.[5] In 1968, archaeologists from the Milwaukee Public Museum found human burials and artifacts, including stone altars, arrowheads, and pottery shards, during an excavation of one of the mounds. Radiocarbon samples from the excavation date the mounds' construction to approximately 480 BCE, making it one of the oldest mound groups in the state.[6][7]

In the mid-1800s, Increase A. Lapham identified a group of circular mounds in the Saukville area and found a stone ax. In his writing, Lapham did not speculate about the age of the artifact or the mounds.[8] An additional artifact of the early Native American presence in the Saukville area is the Ozaukee County Birdstone, discovered by a six-year-old farm boy in 1891.[9] While the exact age of the Ozaukee County Birdstone remains uncertain, many birdstones date from a period ranging from 3000 BCE to 500 BCE.[10]

19th century[edit]

In the early 19th century, the Native Americans living in Ozaukee County included the Menominee, Potawatomi, and Sauk people. There were numerous Native American villages in the county along the Milwaukee River and its tributaries. The Menominee surrendered their claims to the land east of the Milwaukee River to the United States Federal Government in 1832 through the Treaty of Washington. The Potawatomi surrendered their claims to the land west of the river in 1833 through the 1833 Treaty of Chicago, which (after being ratified in 1835) required them to leave the area by 1838. While many Potawatomi people moved west of the Mississippi River to Kansas, some chose to remain in Wisconsin, and were known as "strolling Potawatomi" because they were migrant squatters. Eventually the Potawatomi who evaded forced removal gathered in northern Wisconsin, where they formed the Forest County Potawatomi Community.[11][12]

The first whites in the area were primarily New England land speculators, who began purchasing land from the government in 1835 at the price of $1.25 per acre.[13] One of these land speculators was Wooster Harrison, who settled the land that would become Port Washington in 1835, which he originally named "Wisconsin City."[14][15] At the time, the land was part of Washington County, and there were proposals that Port Washington become the county seat.[16] However, Port Washington was far from the county's other early settlements, including Mequon, Grafton and Germantown. In 1850, the Wisconsin legislature bisected Washington County into northern and southern counties, with Port Washington as the northern seat and Cedarburg as the southern. County residents failed to ratify the bill, and in 1853 the legislature instead bisected the county into eastern and western sections, creating Ozaukee County. Port Washington became the seat of the new county, and the Washington County seat moved to West Bend.[17]

In the 1840s, German, Irish, and Luxembourger immigrants began settling in the county. Germans were the largest ethnic group in and 19th century Ozaukee County,[18] with seven in eight residents being of German descent according to the 1870 census.[19] The earliest settlements formed around grist- and sawmills located on the county's waterways. Cedarburg, Grafton, Hamilton, Newburg, Saukville, and Thiensville all had mills by end of the 1840s. In the 19th and early 20th centuries, the county economy was primarily based on agriculture.[18]

The beginning of the American Civil War saw some chaos in Ozaukee County. The county was one of the areas affected by Wisconsin's "Great Indian Scare" of September 1862, in which some residents panicked because of unfounded rumors of a Native American uprising in the state. The panic was exacerbated by the fact that 30,000 Wisconsinites were away, serving in the war, so residents may have felt especially vulnerable. Some residents fled their homes for Milwaukee, while others holed up in makeshift fortresses, as happened at the Cedarburg Mill.[20] Several months after the panic, the United States Congress implemented the draft, which was unpopular among German immigrants with bad memories of mandatory conscription in their homelands.[21] On November 10, 1862, several hundred Port Washington residents marched on the courthouse, attacked the official in charge of implementing the draft, burned draft records, and vandalized the homes of Union supporters. The riot ended when eight detachments of Union troops from Milwaukee were deployed.[22]

In the 1870s the Milwaukee & Northern Railway was constructed to connect Milwaukee and northern Wisconsin including Green Bay,[23] along its route it reached many communities in the center of the county including Thiensville, Cedarburg, Grafton and Saukville.[23] Around the same time the Milwaukee, Lake Shore and Western Railway constructed its railway on the eastern edge of the county along Lake Michigan, also to connect Milwaukee and Northern Wisconsin.[24] It reached fewer communities compared to the M&N line, only serving Port Washington.[24] Regardless the railroads spurned development in Ozaukee County by providing efficient freight and passenger transportation.

20th century[edit]

From 1908 to 1940, the Milwaukee Electric Railway and Light Company (TMERL) provided electric interurban passenger and freight service from Sheboygan to Milwaukee with stops at Belgium, Port Washington, Grafton, Cedarburg, Thiensville, Mequon, and other villages as well as major road crossings within Ozaukee County. The interurban cars ran approximately once per hour and delivered Ozaukee County agricultural products, such as milk and meat, to Milwaukee grocers and butchers. In 1940, the interurban ceased servicing Sheboygan due to declining ridership. Port Washington became the line's new northern terminus[25] before the Ozaukee County line ceased operation in 1948.[18]

Ozaukee County's communities experienced significant population growth during the suburbanization that followed World War II. Between 1940 and 1980, the population more than tripled, from 18,985 to 66,981. Although the interurban to Milwaukee declined service and finally ceased operation after the war, the construction of Interstate 43 in the mid-1960s allowed more residents to commute long distances to jobs and this encouraged residential home construction.[18] Communities that experienced the most significant population growth, such as Cedarburg and Grafton, began to annex agricultural land for residential subdivisions and retail commercial development.[26] The previously rural Town of Mequon became increasingly suburban and incorporated in 1957 as the City of Mequon. Today, it is the largest and most populous city in Ozaukee County.

21st century[edit]

The Wisconsin Shipwreck Coast National Marine Sanctuary was established in 2021 in the waters of Lake Michigan, with its southern portion lying off roughly the northern half of Ozaukee County′s coastline. The national marine sanctuary is the site of a large number of historically significant shipwrecks.[27][28][29]


Lake Michigan shoreline, near Port Washington

Ozaukee County covers 233 square miles of land, making it the second smallest county in Wisconsin by land area after Pepin County. The county's jurisdiction also extends over 883 square miles of water, most of which is in Lake Michigan.[30][31]

Lion's Den Gorge Nature Preserve is a large bluffland and wetland county protected area on the shore of Lake Michigan.

Major highways[edit]



Adjacent counties[edit]


Historical population
U.S. Decennial Census[32]
1790–1960[33] 1900–1990[34]
1990–2000[35] 2010[36] 2020[1]

2020 census[edit]

As of the census of 2020,[1] the population was 91,503. The population density was 392.7 people per square mile (151.6 people/km2). There were 39,086 housing units at an average density of 167.7 units per square mile (64.7 units/km2). The racial makeup of the county was 89.9% White, 2.5% Asian, 1.7% Black or African American, 0.3% Native American, 1.1% from other races, and 4.6% from two or more races. Ethnically, the population was 3.4% Hispanic or Latino of any race.

2000 Census Age Pyramid for Ozaukee County

2000 census[edit]

As of the census[38] of 2000, there were 82,317 people, 30,857 households, and 23,019 families residing in the county. The population density was 355 people per square mile (137 people/km2). There were 32,034 housing units at an average density of 138 units per square mile (53 units/km2). The racial makeup of the county was 96.72% White, 0.93% Black or African American, 0.20% Native American, 1.07% Asian, 0.02% Pacific Islander, 0.34% from other races, and 0.73% from two or more races. 1.30% of the population were Hispanic or Latino of any race. 47.2% were of German, 7.3% Irish and 6.7% Polish ancestry. 95.1% spoke English, 1.6% Spanish and 1.4% German as their first language.

There were 30,857 households, out of which 36.00% had children under the age of 18 living with them, 65.60% were married couples living together, 6.50% had a female householder with no husband present, and 25.40% were non-families. 21.40% of all households were made up of individuals, and 8.40% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.07.

In the county, the population was spread out, with 26.60% under the age of 18, 6.80% from 18 to 24, 28.00% from 25 to 44, 25.90% from 45 to 64, and 12.60% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.30 males. For every 100 females age 18 and over, there were 94 males.

The median income for a household in the county was $62,745, and the median income for a family was $72,547 (these figures had risen to $73,197 and $88,231 respectively as of a 2007 estimate[39]). Males had a median income of $50,044 versus $30,476 for females. The per capita income for the county was $31,947. About 1.7% of families and 2.6% of the population were below the poverty line, including 2.6% of those under age 18 and 4.1% of those age 65 or over.

Religious statistics[edit]

The Association of Religion Data Archives reported that as of 2010, the largest religious group in Ozaukee County is the Roman Catholic Archdiocese of Milwaukee, with 28,644 adherents spread across eight parishes. Although the number of Catholics in the county is around the same as it was in 1990, the number of parishes has declined from twelve in 1990 to eight in 2010,[40] because of the mergers of small, rural and local parishes into larger, multi-campus parishes, such as the St. John XXIII Congregation in Port Washington and Saukville, which formed from the merger of three parishes and holds services in three church buildings.[41] Other large religious groups in the county include 8,464 Missouri Synod Lutherans with seven congregations, 5,094 ELCA Lutherans with ten congregations, 2,702 Wisconsin Synod Lutherans with seven congregations, 1,795 adherents of the Presbyterian Church (USA) with one congregation, 1,558 adherents of the United Church of Christ with three congregations, 1,154 UMC Methodists with three congregations, 1,061 adherents of the evangelical Christian and Missionary Alliance with two congregations, 794 non-denominational Christians with four congregations, and 695 adherents of Orthodox and Reconstructionist Judaism with three synagogues, as well as other congregations in the Baháʼí, Christian Scientist, evangelical Protestant, Greek Orthodox, Hindu, Jehovah's Witnesses, Latter-day Saints, mainline Protestant, and Unitarian Universalist traditions.[40]


Ozaukee County has a harbor in Port Washington on Lake Michigan, though not in the lakeside communities of Mequon or Grafton due to high bluffs along the lakeshore.

The Ozaukee County Interurban Trail is a multimodal trail for pedestrians and non-motorized vehicles. It runs through Grafton and connects to Sheboygan County and Brown Deer Trails via the old Milwaukee-Sheboygan Passenger Rail line.

Public transit is provided by a commuter express bus (Route 143) to Milwaukee with stops in Port Washington, Saukville, Grafton, and Mequon. The bus operates Monday through Fridays excluding holidays, and is run jointly by Milwaukee and Ozaukee County. The county offers a daily shared taxi, with connections to Washington County Transit and Milwaukee County Routes 12, 49 and 42u.


As one of the suburban counties surrounding Milwaukee, Ozaukee County is a Republican stronghold in U.S. presidential elections, having voted Republican in all elections (except one) since 1940. Lyndon B. Johnson was the last Democrat to carry the county in a presidential election, in 1964. Following similar suburban trends across the nation, the county has grown more Democratic in recent years. In 2020, Joe Biden became the first Democrat to win over 40% of the vote since 1964.[42] Biden also won the municipality of Cedarburg, the first time a Democrat has won a municipality in any of the WOW Counties since 1996.[43] Progressive judge Janet Protasiewicz received nearly 48% of the vote in Ozaukee in the 2023 Wisconsin Supreme Court election.[44]

United States presidential election results for Ozaukee County, Wisconsin[42]
Year Republican Democratic Third party
No.  % No.  % No.  %
2020 33,912 55.15% 26,517 43.13% 1,057 1.72%
2016 30,464 55.84% 20,170 36.97% 3,926 7.20%
2012 36,077 64.63% 19,159 34.32% 581 1.04%
2008 32,172 60.29% 20,579 38.56% 614 1.15%
2004 34,904 65.82% 17,714 33.40% 414 0.78%
2000 31,155 65.24% 15,030 31.48% 1,566 3.28%
1996 22,078 56.67% 13,269 34.06% 3,614 9.28%
1992 22,805 53.15% 11,879 27.68% 8,226 19.17%
1988 22,899 63.94% 12,661 35.35% 252 0.70%
1984 23,898 68.48% 10,765 30.85% 233 0.67%
1980 21,371 61.00% 10,779 30.77% 2,883 8.23%
1976 19,817 62.17% 11,271 35.36% 789 2.48%
1972 15,759 61.88% 8,503 33.39% 1,204 4.73%
1968 12,155 58.11% 7,246 34.64% 1,518 7.26%
1964 8,581 47.35% 9,517 52.51% 25 0.14%
1960 10,401 58.91% 7,228 40.94% 28 0.16%
1956 9,808 69.63% 4,139 29.38% 139 0.99%
1952 8,665 66.97% 4,241 32.78% 33 0.26%
1948 4,866 52.85% 4,159 45.17% 183 1.99%
1944 5,655 60.66% 3,579 38.39% 89 0.95%
1940 4,913 56.32% 3,662 41.98% 148 1.70%
1936 1,785 22.54% 5,594 70.65% 539 6.81%
1932 1,182 16.51% 5,770 80.59% 208 2.91%
1928 2,338 37.16% 3,864 61.41% 90 1.43%
1924 1,015 20.71% 592 12.08% 3,293 67.20%
1920 3,523 75.60% 835 17.92% 302 6.48%
1916 1,610 49.42% 1,577 48.40% 71 2.18%
1912 749 25.24% 1,878 63.27% 341 11.49%
1908 1,216 38.48% 1,856 58.73% 88 2.78%
1904 1,492 47.52% 1,501 47.80% 147 4.68%
1900 1,280 38.42% 1,992 59.78% 60 1.80%
1896 1,535 42.79% 1,947 54.28% 105 2.93%
1892 652 23.26% 2,094 74.71% 57 2.03%





Census-designated place[edit]

Unincorporated communities[edit]

Ghost town[edit]

High schools[edit]

See also[edit]


  1. ^ a b c d "2020 Decennial Census: Ozaukee County, Wisconsin". data.census.gov. U.S. Census Bureau. Retrieved July 5, 2022.
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. ^ "America's Best Places To Raise A Family". Forbes. June 30, 2008. Archived from the original on July 4, 2008.
  4. ^ "Ozaukee County". Wisconsin Historical Society. Retrieved April 10, 2018.
  5. ^ "Ecological Landscapes of Wisconsin: Central Lake Michigan Coastal Ecological Landscape" (PDF). Wisconsin Department of Natural Resources. Archived (PDF) from the original on October 9, 2022. Retrieved February 13, 2020.
  6. ^ "Searching for the 'Spirit of the Place'". Shepherd Express. Retrieved January 18, 2020.
  7. ^ "Hilgen Spring Mound Site Revisited: Lecture". Localeben. Retrieved January 18, 2020.
  8. ^ Lapham, Increase A. (1855). "Chapter 1: Ancient Works in the Vicinity of Lake Michigan". The Antiquities of Wisconsin, as Surveyed and Described by I. A. Lapham, Civil Engineer, etc., on Behalf of the American Antiquarian Society. Washington, D.C.: Smithsonian Institution.
  9. ^ Beer, James R. (2003). "Ozaukee County Birdstone Stays Home in Wisconsin". Central States Archaeological Journal. 50 (1): 39. Retrieved June 27, 2021.
  10. ^ "Birdstones". wisconsinhistory.org. Wisconsin Historical Society. Retrieved June 27, 2021. Birdstones are pre-contact abstract stone carvings that seem to our 21st Century eyes to represent birds. The majority appear to have been made between 5000 and 2500 years ago.
  11. ^ "Potawatomi History". Milwaukee Public Museum. Retrieved February 20, 2020.
  12. ^ Gerwing, Anselm J. (Summer 1964). "The Chicago Indian Treaty of 1833". Journal of the Illinois State Historical Society. 57 (2): 117–142. ISSN 0019-2287. JSTOR 40190019.
  13. ^ "History of Ozaukee County". Ozaukee County. Retrieved January 11, 2020.
  14. ^ Sister M. Jane Frances Price, S.S.N.S., The History of Port Washington, in Ozaukee County, Wisconsin (Ph.D. diss., De Paul University, 1943), pp. 7-8.
  15. ^ Chicago and North Western Railway Company (1908). A History of the Origin of the Place Names Connected with the Chicago & North Western and Chicago, St. Paul, Minneapolis & Omaha Railways. p. 115.
  16. ^ "History of Ozaukee County"
  17. ^ "Encyclopedia of Milwaukee: Ozaukee County". University of Wisconsin-Milwaukee. Retrieved January 11, 2020.
  18. ^ a b c d "Encyclopedia of Milwaukee: Ozaukee County"
  19. ^ "Early history of Ozaukee County, Wisconsin". University of Wisconsin-Madison Libraries. Retrieved January 11, 2020.
  20. ^ "Early history of Ozaukee County, Wisconsin". University of Wisconsin-Madison Libraries. Retrieved January 1, 2020.
  21. ^ "Civil War: Draft Riots (1862)". Wisconsin Historical Society. Retrieved January 4, 2020.
  22. ^ Gurda, John (1999). "Chapter 3. Here Come the Germans, 1846–1865". The Making of Milwaukee. Milwaukee County Historical Society. p. 97.
  23. ^ a b "the Railroad – Milwaukee & Northern Railway Historical Society". www.mnrhs.org. Retrieved May 6, 2021.
  24. ^ a b "Map of the Milwaukee, Lake Shore & Western Railway | Map or Atlas". Wisconsin Historical Society. December 1, 2003. Retrieved May 6, 2021.
  25. ^ Classic Trains Magazine, Vol 20, No. 2, Summer 2020 issue, p 52.
  26. ^ "Encyclopedia of Milwaukee: Village of Grafton". University of Wisconsin-Milwaukee. Retrieved January 2, 2020.
  27. ^ "Wisconsin Shipwreck Coast National Marine Sanctuary Designation; Final Regulations". NOAA via Federal Register. June 23, 2021. Retrieved June 29, 2021.
  28. ^ National Marine Sanctuaries media document: Wisconsin Shipwreck Coast National Marine Sanctuary Accessed 29 June 2021
  29. ^ NOAA News "NOAA designates new national marine sanctuary in Wisconsin’s Lake Michigan," June 22, 2021 Accessed 29 June 2021
  30. ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved August 8, 2015.
  31. ^ "Overview of Ozaukee County | Ozaukee County, WI - Official Website". www.co.ozaukee.wi.us. Retrieved September 19, 2018.
  32. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved August 6, 2015.
  33. ^ "Historical Census Browser". University of Virginia Library. Retrieved August 6, 2015.
  34. ^ Forstall, Richard L., ed. (March 27, 1995). "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved August 6, 2015.
  35. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Archived (PDF) from the original on October 9, 2022. Retrieved August 6, 2015.
  36. ^ "State & County QuickFacts". United States Census Bureau. Archived from the original on June 6, 2011. Retrieved January 22, 2014.
  37. ^ "County Population Totals: 2010-2020". Retrieved June 20, 2021.
  38. ^ "U.S. Census website". United States Census Bureau. Retrieved May 14, 2011.
  39. ^ "Ozaukee County, Wisconsin - Fact Sheet - American FactFinder". Factfinder.census.gov. Archived from the original on February 11, 2020. Retrieved July 22, 2010.
  40. ^ a b "County Membership Report: Ozaukee County (Wisconsin)". The Association of Religion Data Archives. 2010. Retrieved August 24, 2020.
  41. ^ "St. John XXIII Catholic Parish: History of our Parish". St. John XXIII Catholic Parish. Retrieved May 4, 2020.
  42. ^ a b Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved November 11, 2020.
  43. ^ "The 'WOW' counties suburbs are diverging politically, as some get redder and others grow increasingly purple". Journal Sentinel. Retrieved August 23, 2023.
  44. ^ "Wisconsin Supreme Court Election Results". The New York Times. April 4, 2023. ISSN 0362-4331. Retrieved August 23, 2023.

Further reading[edit]

External links[edit]

43°23′55″N 87°53′37″W / 43.398475°N 87.893572°W / 43.398475; -87.893572

Media related to Ozaukee County, Wisconsin at Wikimedia Commons