Data / Median age / Johnson County

Median age in Johnson County

Median age in Johnson County was 41.4 years in 2024, according to the U.S. Census Bureau. That is down 1.3 from 2023. That is the 64th highest of 102 counties in 2024.

2024, years41.4
Change on 2023-1.3
Rank64th of 102Counties in Illinois ranked
Series high43.42021
Series low41.42024

Median age in Johnson County, 2021 to 2024

CSVChart (SVG)

4141.54242.54343.520212022202320242021: 43.4 years2022: 42.3 years2023: 42.7 years2024: 41.4 years
years. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-01-29.
All 4 values
Periodyears
202441.4
202342.7
202242.3
202143.4

Compared with Illinois and United States

Place2024
Johnson County41.4
Illinois39
United States38.9

Rankings

Definition

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.

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Questions

What is the median age in Johnson County?

Median age in Johnson County was 41.4 years in 2024, according to the U.S. Census Bureau. That is down 1.3 from 2023. That is the 64th highest of 102 counties in 2024.

Where does this figure come from?

U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved by Invokely on 2026-10-08.

What was the highest median age in Johnson County?

43.4 years in 2021, the highest value since 2021 in this series.

More statistics for Johnson County

All statistics for Johnson County