Winnebago County, Illinois
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City Hall in Rockford, Illinois.
Location within the U.S. state of Illinois
Illinois's location within the U.S.
|Founded||January 16, 1836|
|Named for||Winnebago Tribe|
|• Total||519 sq mi (1,340 km2)|
|• Land||513 sq mi (1,330 km2)|
|• Water||5.9 sq mi (15 km2) 1.1%%|
|• Density||575/sq mi (222/km2)|
|Time zone||UTC−6 (Central)|
|• Summer (DST)||UTC−5 (CDT)|
|Congressional districts||16th, 17th|
Winnebago County is a county in the U.S. state of Illinois. According to the 2010 census, it had a population of 295,266, making it the seventh most populous county in Illinois after Cook County. Its county seat is Rockford.