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Winnebago County

county in Illinois, United States

Key facts

Country: United States
State: Illinois
Founded: January 16, 1836
Named after: Winnebago (Ho-Chunk) people
Seat: Rockford
Largest city: Rockford
Total: 519 sq mi (1,340 km )
Land: 513 sq mi (1,330 km )
Water: 5.9 sq mi (15 km ) 1.1%
Estimate 2025: 283,674
Density: 556/sq mi (215/km )
Time zone: UTC−6 ( Central )
Summer dst: UTC−5 ( CDT )
Congressional districts: 16th , 17th
Website: wincoil .gov

via Wikipedia infobox

Article

Winnebago County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 285,350 making it the seventh most populous county in Illinois behind Cook County and its five surrounding collar counties. Its county seat is Rockford. Winnebago County is the central county of the Rockford metropolitan area.

History