How Rock Island County Compares

Rock Island County

40.3 years

Illinois Average

40.3 years

Rank #77 of 102 in state

National

38.9 years

3.6% above

National Distribution

Where Rock Island County falls among all 3,222 U.S. counties for median age.

21.4 years 86.2 years

■ Rock Island County: 40.3 years

Ranking Context

Rank	County	Value
#2,018	Irwin County, GA	40.3 years
#2,019	Mitchell County, GA	40.3 years
#2,020	Washington County, GA	40.3 years
#2,021	Rock Island County, IL	40.3 years
#2,022	Dubois County, IN	40.3 years
#2,023	Jennings County, IN	40.3 years
#2,024	Buchanan County, IA	40.3 years

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Median Age in Rock Island County, Illinois

Rock Island County, Illinois has a median age of 40.3 years, which ranks #2,021 of 3,222 out of 3,222 counties nationwide. This is 3.6% above the national value of 38.9 years.

Within Illinois, Rock Island County ranks #77 of 102 out of 102 counties. This places it in the 37th percentile nationally.

The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.

About this data

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.