Rock County, Wisconsin
Rock County, Wisconsin | |
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Rock County Courthouse | |
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Seal | |
Location within the U.S. state of Wisconsin | |
| 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 (2024) | 165,461 |
| • Density | 228/sq mi (88.0/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 metropolitan statistical area and is included in the Madison–Janesville–Beloit combined statistical area.