How DeKalb County Compares

DeKalb County

32.7 years

Illinois Average

32.7 years

Rank #100 of 102 in state

National

38.9 years

15.9% below

National Distribution

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

21.4 years 86.2 years

■ DeKalb County: 32.7 years

Ranking Context

Rank	County	Value
#3,088	Coryell County, TX	32.8 years
#3,089	Midland County, TX	32.8 years
#3,090	Kern County, CA	32.7 years
#3,091	DeKalb County, IL	32.7 years
#3,092	LaGrange County, IN	32.7 years
#3,093	Boone County, MO	32.7 years
#3,094	Holmes County, OH	32.7 years

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Median Age in DeKalb County, Illinois

DeKalb County, Illinois has a median age of 32.7 years, which ranks #3,091 of 3,222 out of 3,222 counties nationwide. This is 15.9% below the national value of 38.9 years.

Within Illinois, DeKalb County ranks #100 of 102 out of 102 counties. This places it in the 4th 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.