Data / Population / Flathead County

Population in Flathead County

Population in Flathead County was 115,429 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 4th highest of 56 counties in 2025.

2025, persons115,429
Change on 2024+0.9%
Rank4th of 56Counties in Montana ranked
Series high115,4292025
Series low104,8732020

Population in Flathead County, 2020 to 2025

CSVChart (SVG)

102.5K105K107.5K110K112.5K115K117.5K2020202120222023202420252020: 104,873 persons2021: 108,760 persons2022: 111,687 persons2023: 113,381 persons2024: 114,367 persons2025: 115,429 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
2025115,429
2024114,367
2023113,381
2022111,687
2021108,760
2020104,873

Compared with Montana and United States

Place2025
Flathead County115,429
Montana1,144,694
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 Flathead County?

Population in Flathead County was 115,429 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 4th highest of 56 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 Flathead County?

115,429 in 2025, the highest value since 2020 in this series.

More statistics for Flathead County

All statistics for Flathead County