Ozaukee County, Wisconsin facts for kids

Kids Encyclopedia Facts
Ozaukee County, Wisconsin
Map of Wisconsin highlighting Ozaukee County
Location in the state of Wisconsin
Map of the USA highlighting Wisconsin
Wisconsin's location in the U.S.
Founded 1853
Seat Port Washington
Largest City Mequon
 - Total
 - Land
 - Water

1,116 sq mi (2,890 km²)
233 sq mi (603 km²)
883 sq mi (2,287 km²), 79%
 - (2010)
 - Density

371/sq mi (143/km²)
Time zone Central: UTC-6/-5
Website: www.co.ozaukee.wi.us

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.

Ozaukee County is included in the Milwaukee-Waukesha-West Allis, WI Metropolitan Statistical Area.

As of the 2000 Census, Ozaukee County had the 2nd 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 was once part of neighboring Washington County to the west. Its name comes from the Ojibwe name for the Sacs. The word probably means "people living at the mouth of a river."


According to the U.S. Census Bureau, the county has a total area of 1,116 square miles (2,890 km2), of which 233 square miles (600 km2) is land and 883 square miles (2,290 km2) (79%) is water. It is the second-smallest county in Wisconsin by land area.

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

Major highways

  • I-43.svg Interstate 43
  • WIS 32.svg Highway 32 (Wisconsin)
  • WIS 33.svg Highway 33 (Wisconsin)
  • WIS 57.svg Highway 57 (Wisconsin)
  • WIS 60.svg Highway 60 (Wisconsin)
  • WIS 167.svg Highway 167 (Wisconsin)
  • WIS 181.svg Highway 181 (Wisconsin)

Adjacent counties


USA Ozaukee County, Wisconsin age pyramid
2000 Census Age Pyramid for Ozaukee County
Historical population
Census Pop.
1860 15,682
1870 15,564 −0.8%
1880 15,461 −0.7%
1890 14,943 −3.4%
1900 16,363 9.5%
1910 17,123 4.6%
1920 16,335 −4.6%
1930 17,394 6.5%
1940 18,985 9.1%
1950 23,361 23.0%
1960 38,441 64.6%
1970 54,421 41.6%
1980 66,981 23.1%
1990 72,831 8.7%
2000 82,317 13.0%
2010 86,395 5.0%
Est. 2015 87,850 1.7%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2010–2014
LionsDen Oz-Co-WI
Lake Michigan shoreline, near Port Washington

As of the census 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/km²). There were 32,034 housing units at an average density of 138 per square mile (53/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 according to Census 2000. 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). 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.


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.





Census-designated place

Unincorporated communities

Ozaukee County, Wisconsin Facts for Kids. Kiddle Encyclopedia.