Winnebago County, Illinois
county in Illinois, United States
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.
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|