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All Rock Island County population data above are from the US Census Bureau.
The population data for Rock Island 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 Carroll County, Kendall County, Tazewell County, and Winnebago 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 144,784 people, Rock Island County is the 14th most populated county in the state of Illinois out of 102 counties. But watch out, Rock Island County, because Kendall County with 124,695 people and Tazewell County with 134,385 people are right behind you.
The largest Rock Island County racial/ethnic groups are White (73.9%) followed by Hispanic (12.3%) and Black (9.2%).
In 2015, the median household income of Rock Island County residents was $48,817. Rock Island County households made slightly more than Carroll County households ($48,631) and Winnebago County households ($48,225) . However, 14.9% of Rock Island County residents live in poverty.
The median age for Rock Island County residents is 40.0 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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