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Rock County

county in Wisconsin, United States

Key facts

Country: United States
State: Wisconsin
Named after: Rock River
Seat: Janesville
Largest city: Janesville
Total: 726 sq mi (1,880 km )
Land: 718 sq mi (1,860 km )
Water: 8.0 sq mi (21 km ) 1.1%
Estimate 2025: 166,472
Density: 228/sq mi (88.0/km )
Time zone: UTC−6 ( Central )
Summer dst: UTC−5 ( CDT )
Congressional districts: 1st , 2nd
Website: www .co .rock .wi .us

via Wikipedia infobox

Article

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.

History