Data / Population / Johnson County

Population in Johnson County

Population in Johnson County was 13,363 in 2025, according to the U.S. Census Bureau. That is up 0.1% from 2024. That is the 77th highest of 102 counties in 2025.

2025, persons13,363
Change on 2024+0.1%
Rank77th of 102Counties in Illinois ranked
Series high13,4722021
Series low13,3172020

Population in Johnson County, 2020 to 2025

CSVChart (SVG)

13.3K13.4K13.4K13.5K13.5K2020202120222023202420252020: 13,317 persons2021: 13,472 persons2022: 13,399 persons2023: 13,366 persons2024: 13,347 persons2025: 13,363 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202513,363
202413,347
202313,366
202213,399
202113,472
202013,317

Compared with Illinois and United States

Place2025
Johnson County13,363
Illinois12,719,141
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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Questions

What is the population in Johnson County?

Population in Johnson County was 13,363 in 2025, according to the U.S. Census Bureau. That is up 0.1% from 2024. That is the 77th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Johnson County?

13,472 in 2021, the highest value since 2020 in this series.

More statistics for Johnson County

All statistics for Johnson County