Rock County, Wisconsin
| Rock County, Wisconsin | ||
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Rock County Courthouse
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 Location in the U.S. state of Wisconsin |
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 Wisconsin's location in the U.S. |
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| Founded | 1839 | |
| Named for | Rock River | |
| Seat | Janesville | |
| Largest city | Janesville | |
| Area | ||
| • Total | 726 sq mi (1,880 km2) | |
| • Land | 718 sq mi (1,860 km2) | |
| • Water | 8.0 sq mi (21 km2), 1.1% | |
| Population | ||
| • (2010) | 160,331 | |
| • Density | 223/sq mi (86/km²) | |
| Congressional districts | 1st, 2nd | |
| Time zone | Central: UTC-6/-5 | |
| Website | www |
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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.
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.
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.
Southern Wisconsin Regional Airport (KJVL) serves Rock County and the surrounding communities.
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.
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