Map of Ozaukee County, Wisconsin

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.

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.

Ozaukee County overview:
Name:	Ozaukee County
FIPS code:	55-089
State:	Wisconsin
Founded:	1853
Seat:	Port Washington
Largest city:	Mequon
Total Area:	1,116.2 sq mi (2,891 km²)
Land Area:	233.08 sq mi (603.7 km²)
Total Population:	91,503
Population Density:	392.7/sq mi (151.6/km²)

Ozaukee County location map. Where is Ozaukee County?

Ozaukee County location on the U.S. Map. Where is Ozaukee County. — Location of Ozaukee County in the the United States.

Ozaukee County location on the Wisconsin map. Where is Ozaukee County. — Location of Ozaukee County in Wisconsin.

History

Precolonial

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. 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.

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. 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. While the exact age of the Ozaukee County Birdstone remains uncertain, many birdstones date from a period ranging from 3000 BCE to 500 BCE.

19th century

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.

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. 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.” At the time, the land was part of Washington County, and there were proposals that Port Washington become the county seat. 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.

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, with seven in eight residents being of German descent according to the 1870 census. 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.

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. 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. 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.

In the 1870s the Milwaukee & Northern Railway was constructed to connect Milwaukee and northern Wisconsin including Green Bay, along its route it reached many communities in the center of the county including Thiensville, Cedarburg, Grafton and Saukville. 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. It reached fewer communities compared to the M&N line, only serving Port Washington. Regardless the railroads spurned development in Ozaukee County by providing efficient freight and passenger transportation.

20th century

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 before the Ozaukee County line ceased operation in 1948.

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. 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. 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.

Ozaukee County Road Map

Ozaukee CountyStreet Map. — Street map of Ozaukee County, Wisconsin. Source: OpenStreetMap (OSM)

Geography

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.

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