Data / Population / Piatt County

Population in Piatt County

Population in Piatt County was 16,791 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 62nd highest of 102 counties in 2025.

2025, persons16,791
Change on 2024+0.9%
Rank62nd of 102Counties in Illinois ranked
Series high16,7912025
Series low16,6422024

Population in Piatt County, 2020 to 2025

CSVChart (SVG)

16.6K16.7K16.7K16.8K16.8K2020202120222023202420252020: 16,688 persons2021: 16,770 persons2022: 16,682 persons2023: 16,736 persons2024: 16,642 persons2025: 16,791 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202516,791
202416,642
202316,736
202216,682
202116,770
202016,688

Compared with Illinois and United States

Place2025
Piatt County16,791
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 Piatt County?

Population in Piatt County was 16,791 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 62nd 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 Piatt County?

16,791 in 2025, the highest value since 2020 in this series.

More statistics for Piatt County

All statistics for Piatt County