Rock County, Wisconsin
Rock County | |
|---|---|
Rock County Courthouse | |
Location within the U.S. state of Wisconsin | |
Wisconsin's location within the U.S. | |
| Coordinates: 42°40′N 89°04′W / 42.67°N 89.07°W | |
| Country | United States |
| State | Wisconsin |
| Founded | 1839 |
| Named after | 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 (2020) | |
• Total | 163,687 |
• Estimate (2023) | 164,278 |
| • Density | 230/sq mi (87/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional districts | 1st, 2nd |
| Website | www |
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.