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All Williamson County population data above are from the US Census Bureau.
The population data for Williamson County are from the Census 2000, Census 2010, the Census' American Community Survey 2015 5-year estimates and the Census' 2016 Population Estimates. The demographic data for Adams County, Clay County, Hamilton County, and Jackson County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2015 5-year estimates, and were downloaded on December 2016. Check out our FAQ section for more details.
With 67,560 people, Williamson County is the 22nd most populated county in the state of Illinois out of 102 counties. But watch out, Williamson County, because Adams County with 66,578 people and Jackson County with 58,870 people are right behind you.
The largest Williamson County racial/ethnic groups are White (90.7%) followed by Black (4.1%) and Hispanic (2.3%).
In 2015, the median household income of Williamson County residents was $44,453. Williamson County households made slightly more than Clay County households ($44,209) and Hamilton County households ($44,159) . However, 15.0% of Williamson County residents live in poverty.
The median age for Williamson County residents is 41.0 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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