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Rock County, Wisconsin
Seal of Rock County, Wisconsin
Map of Wisconsin highlighting Rock County
Location in the state of Wisconsin
Map of the U.S. highlighting Wisconsin
Wisconsin's location in the U.S.
Founded 1836
Seat Janesville
 - Total
 - Land
 - Water

726 sq mi (1,880 km²)
720 sq mi (1,865 km²)
6 sq mi (16 km²), 0.79%
 - (2010)
 - Density

212/sq mi (82/km²)

Rock County is a county in the U.S. state of Wisconsin. It is included in the Janesville, Wisconsin, Metropolitan Statistical Area. As of 2010, the population was 160,331. Its county seat is Janesville.[1]

Geography[edit | edit source]

According to the U.S. Census Bureau, the county has a total area of 726 square miles (1,880 km2), of which 720 square miles (1,900 km2) is land and 6 square miles (16 km2) (0.79%) is water.

History[edit | edit source]

Rock County was created in 1836 as a territorial county on December 7, 1836 from Milwaukee County and fully organized Feb. 19, 1839. The county is named for the Rock River, which bisects the county from north to south.[2]

Major highways[edit | edit source]

Adjacent counties[edit | edit source]

Demographics[edit | edit source]

2000 Census Age Pyramid for Rock County.

Historical populations
Census Pop.
1900 51,203
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%
WI Counties 1900-1990

As of the census[3] 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.

Cities, villages, and towns[4][edit | edit source]

Unincorporated communities[edit | edit source]

Ghost towns[edit | edit source]

See also[edit | edit source]

References[edit | edit source]

Further reading[edit | edit source]

External links[edit | edit source]

Coordinates: 42°40′N 89°04′W / 42.67, -89.07

This page uses content from the English language Wikipedia. The original content was at Rock County, Wisconsin. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.
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