Winnebago County
Also known as Winnebago County, Illinois, Winnebago County, IL
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
~9 min read
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
Gallery (5)
On the map
2 mapped locations