Winnebago County Illinois Plat Book

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.
  • Country: United States
  • State: Illinois
  • Founded: January 16, 1836
  • Named after: Winnebago people
  • Seat: Rockford
  • Largest city: Rockford
  • Congressional districts: 16th, 17th

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Data from: en.wikipedia.org