Rock County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 163,687. 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.
| Name: | Rock County |
|---|---|
| FIPS code: | 55-105 |
| State: | Wisconsin |
| Founded: | 1839 |
| Named for: | Rock River |
| Seat: | Janesville |
| Largest city: | Janesville |
| Total Area: | 726 sq mi (1,880 km²) |
| Land Area: | 718 sq mi (1,860 km²) |
| Total Population: | 163,687 |
| Population Density: | 230/sq mi (87/km²) |
Rock County location map. Where is Rock County?
History
Rock County was created 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.
Rock County Road Map
Geography
According to the U.S. Census Bureau, the county has a total area of 726 square miles (1,880 km), of which 718 square miles (1,860 km) is land and 8.0 square miles (21 km) (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.
Rock County Topographic Map
Rock County Satellite Map
Rock County Outline Map
