Data / Population / Union County

Population in Union County

Population in Union County was 11,829 in 2025, according to the U.S. Census Bureau. That is down 0.8% from 2024. That is the 63rd highest of 99 counties in 2025.

2025, persons11,829
Change on 2024-0.8%
Rank63rd of 99Counties in Iowa ranked
Series high12,1302020
Series low11,8292025

Population in Union County, 2020 to 2025

CSVChart (SVG)

11.8K11.9K12K12.1K12.2K2020202120222023202420252020: 12,130 persons2021: 12,049 persons2022: 11,898 persons2023: 11,883 persons2024: 11,924 persons2025: 11,829 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202511,829
202411,924
202311,883
202211,898
202112,049
202012,130

Compared with Iowa and United States

Place2025
Union County11,829
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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What is the latest population in Union County? Cite the source.
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Questions

What is the population in Union County?

Population in Union County was 11,829 in 2025, according to the U.S. Census Bureau. That is down 0.8% from 2024. That is the 63rd 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 Union County?

12,130 in 2020, the highest value since 2020 in this series.

More statistics for Union County

All statistics for Union County