Winnebago County, Illinois

Winnebago County is a county 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. Its county seat is Rockford.

Winnebago County was founded on January 16, 1836 and named for the Winnebago Tribe of American Indians.

 References 

Category:1836 establishments in Illinois
Category:Illinois counties