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All McHenry County population data above are from the US Census Bureau.
The population data for McHenry County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Kane County, Madison County, Will County, and Winnebago 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 308,570 people, McHenry County is the 6th most populated county in the state of Illinois out of 102 counties. But watch out, McHenry County, because Madison County with 264,461 people and Winnebago County with 284,081 people are right behind you.
The largest McHenry County racial/ethnic groups are White (81.9%) followed by Hispanic (12.5%) and Asian (2.7%).
In 2017, the median household income of McHenry County residents was $82,230. McHenry County households made slightly more than Kane County households ($74,862) and Will County households ($80,782) . However, 7.3% of McHenry County residents live in poverty.
The median age for McHenry County residents is 39.9 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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