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All Winnebago County population data above are from the US Census Bureau.
The population data for Winnebago County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2017 Population Estimates. The demographic data for Ford County, Madison County, St. Clair County, and St. Clair County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2017 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 287,512 people, Winnebago County is the 7th most populated county in the state of Illinois out of 102 counties. But watch out, Winnebago County, because Madison County with 266,153 people and St. Clair County with 264,433 people are right behind you.
The largest Winnebago County racial/ethnic groups are White (70.2%) followed by Black (12.4%) and Hispanic (12.2%).
In 2017, the median household income of Winnebago County residents was $51,110. Winnebago County households made slightly more than Ford County households ($50,851) and St. Clair County households ($51,103) . However, 15.3% of Winnebago County residents live in poverty.
The median age for Winnebago County residents is 39.6 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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