Data / Population / Hamilton County

Population in Hamilton County

Population in Hamilton County was 14,944 in 2025, according to the U.S. Census Bureau. That is down 0.4% from 2024. That is the 49th highest of 99 counties in 2025.

2025, persons14,944
Change on 2024-0.4%
Rank49th of 99Counties in Iowa ranked
Series high15,0142020
Series low14,8742021

Population in Hamilton County, 2020 to 2025

CSVChart (SVG)

14.9K14.9K15K15K15.1K2020202120222023202420252020: 15,014 persons2021: 14,874 persons2022: 14,880 persons2023: 14,914 persons2024: 14,998 persons2025: 14,944 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202514,944
202414,998
202314,914
202214,880
202114,874
202015,014

Compared with Iowa and United States

Place2025
Hamilton County14,944
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 Hamilton County? Cite the source.
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Questions

What is the population in Hamilton County?

Population in Hamilton County was 14,944 in 2025, according to the U.S. Census Bureau. That is down 0.4% from 2024. That is the 49th 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 Hamilton County?

15,014 in 2020, the highest value since 2020 in this series.

More statistics for Hamilton County

All statistics for Hamilton County