Data / Population / Decatur County

Population in Decatur County

Population in Decatur County was 7,655 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 86th highest of 99 counties in 2025.

2025, persons7,655
Change on 2024-0.3%
Rank86th of 99Counties in Iowa ranked
Series high7,8072022
Series low7,6552025

Population in Decatur County, 2020 to 2025

CSVChart (SVG)

7,6507,7007,7507,8007,8502020202120222023202420252020: 7,728 persons2021: 7,796 persons2022: 7,807 persons2023: 7,777 persons2024: 7,675 persons2025: 7,655 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
20257,655
20247,675
20237,777
20227,807
20217,796
20207,728

Compared with Iowa and United States

Place2025
Decatur County7,655
Iowa3,238,387
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 Decatur County?

Population in Decatur County was 7,655 in 2025, according to the U.S. Census Bureau. That is down 0.3% from 2024. That is the 86th highest of 99 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 Decatur County?

7,807 in 2022, the highest value since 2020 in this series.

More statistics for Decatur County

All statistics for Decatur County