Data / Population / Grundy County

Population in Grundy County

Population in Grundy County was 12,361 in 2025, according to the U.S. Census Bureau. That is down 0.1% from 2024. That is the 60th highest of 99 counties in 2025.

2025, persons12,361
Change on 2024-0.1%
Rank60th of 99Counties in Iowa ranked
Series high12,3832023
Series low12,3372020

Population in Grundy County, 2020 to 2025

CSVChart (SVG)

12.3K12.3K12.4K12.4K12.4K12.4K12.4K2020202120222023202420252020: 12,337 persons2021: 12,365 persons2022: 12,367 persons2023: 12,383 persons2024: 12,372 persons2025: 12,361 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202512,361
202412,372
202312,383
202212,367
202112,365
202012,337

Compared with Iowa and United States

Place2025
Grundy County12,361
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 Grundy County? Cite the source.
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Questions

What is the population in Grundy County?

Population in Grundy County was 12,361 in 2025, according to the U.S. Census Bureau. That is down 0.1% from 2024. That is the 60th 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 Grundy County?

12,383 in 2023, the highest value since 2020 in this series.

More statistics for Grundy County

All statistics for Grundy County