Data / Population / Carroll County

Population in Carroll County

Population in Carroll County was 15,419 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 67th highest of 102 counties in 2025.

2025, persons15,419
Change on 2024-0.3%
Rank67th of 102Counties in Illinois ranked
Series high15,7232021
Series low15,4192025

Population in Carroll County, 2020 to 2025

CSVChart (SVG)

15.4K15.5K15.6K15.7K15.8K2020202120222023202420252020: 15,686 persons2021: 15,723 persons2022: 15,563 persons2023: 15,540 persons2024: 15,468 persons2025: 15,419 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202515,419
202415,468
202315,540
202215,563
202115,723
202015,686

Compared with Illinois and United States

Place2025
Carroll County15,419
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 Carroll County?

Population in Carroll County was 15,419 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 67th 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 Carroll County?

15,723 in 2021, the highest value since 2020 in this series.

More statistics for Carroll County

All statistics for Carroll County