Rock County, Wisconsin facts for kids

Kids Encyclopedia Facts
Rock County, Wisconsin
Seal of Rock County, Wisconsin
Map
Map of Wisconsin highlighting Rock County
Location in the state of Wisconsin
Map of the USA highlighting Wisconsin
Wisconsin's location in the U.S.
Statistics
Founded 1839
Seat Janesville
Largest City Janesville
Area
 - Total
 - Land
 - Water

726 sq mi (1,880 km²)
718 sq mi (1,860 km²)
8.0 sq mi (21 km²), 1.1%
Population
 - (2010)
 - Density

160,331
223/sq mi (86/km²)
Time zone Central: UTC-6/-5
Website: www.co.rock.wi.us
Named for: Rock River

Rock County is a county in the U.S. state of Wisconsin. As of the 2010 census, the population was 160,331. Its county seat is Janesville.

Rock County comprises the Janesville-Beloit, WI Metropolitan Statistical Area and is included in the Madison-Janesville-Beloit, WI Combined Statistical Area.

History

Rock County was created in 1836 as a territorial county on December 7, 1836 from Milwaukee County and fully organized February 19, 1839. The county is named for the Rock River, which bisects the county from north to south.

Geography

According to the U.S. Census Bureau, the county has a total area of 726 square miles (1,880 km2), of which 718 square miles (1,860 km2) is land and 8.0 square miles (21 km2) (1.1%) is water.

Cook Memorial Arboretum, a natural area with birding and nature trails, is located northwest of Janesville. It is owned by the Janesville School District.

Transportation

Major highways

Airport

Southern Wisconsin Regional Airport (KJVL) serves Rock County and the surrounding communities.

Adjacent counties

Demographics

USA Rock County, Wisconsin age pyramid
2000 Census Age Pyramid for Rock County
Historical population
Census Pop.
1840 1,701
1850 20,750 1,119.9%
1860 36,690 76.8%
1870 39,030 6.4%
1880 38,823 −0.5%
1890 43,220 11.3%
1900 51,203 18.5%
1910 55,538 8.5%
1920 66,150 19.1%
1930 74,206 12.2%
1940 80,173 8.0%
1950 92,778 15.7%
1960 113,913 22.8%
1970 131,970 15.9%
1980 139,420 5.6%
1990 139,510 0.1%
2000 152,307 9.2%
2010 160,331 5.3%
Est. 2015 161,448 0.7%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2010–2014

As of the census of 2000, there were 152,307 people, 58,617 households, and 40,387 families residing in the county. The population density was 211 people per square mile (82/km²). There were 62,187 housing units at an average density of 86 per square mile (33/km²). The racial makeup of the county was 91.01% White, 4.63% Black or African American, 0.28% Native American, 0.78% Asian, 0.04% Pacific Islander, 1.77% from other races, and 1.50% from two or more races. 3.91% of the population were Hispanic or Latino of any race. 32.8% were of German, 13.0% Norwegian, 10.1% Irish, 7.5% English and 5.5% American ancestry according to Census 2000.

There were 58,617 households out of which 33.60% had children under the age of 18 living with them, 53.50% were married couples living together, 10.90% had a female householder with no husband present, and 31.10% were non-families. 25.10% of all households were made up of individuals and 9.70% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.03.

In the county, the population was spread out with 26.50% under the age of 18, 8.60% from 18 to 24, 29.80% from 25 to 44, 22.30% from 45 to 64, and 12.70% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 97.00 males. For every 100 females age 18 and over, there were 94.10 males.

Communities

Cities

Villages

Towns

Census-designated place

Unincorporated communities

Ghost towns

  • Fellows
  • Jefferson Prairie Settlement

Tree cities

  • Beloit
  • Clinton
  • Evansville
  • Janesville

Rock County, Wisconsin Facts for Kids. Kiddle Encyclopedia.