Data / Population / Lyon County

Population in Lyon County

Population in Lyon County was 12,354 in 2025, according to the U.S. Census Bureau. That is down 0.4% from 2024. That is the 61st highest of 99 counties in 2025.

2025, persons12,354
Change on 2024-0.4%
Rank61st of 99Counties in Iowa ranked
Series high12,4042024
Series low11,9242020

Population in Lyon County, 2020 to 2025

CSVChart (SVG)

11.9K12K12.1K12.2K12.3K12.4K12.5K2020202120222023202420252020: 11,924 persons2021: 12,035 persons2022: 12,180 persons2023: 12,309 persons2024: 12,404 persons2025: 12,354 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202512,354
202412,404
202312,309
202212,180
202112,035
202011,924

Compared with Iowa and United States

Place2025
Lyon County12,354
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 Lyon County?

Population in Lyon County was 12,354 in 2025, according to the U.S. Census Bureau. That is down 0.4% from 2024. That is the 61st 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 Lyon County?

12,404 in 2024, the highest value since 2020 in this series.

More statistics for Lyon County

All statistics for Lyon County