Data / Population / Stillwater County

Population in Stillwater County

Population in Stillwater County was 9,445 in 2025, according to the U.S. Census Bureau. That is up 0.2% from 2024. That is the 25th highest of 56 counties in 2025.

2025, persons9,445
Change on 2024+0.2%
Rank25th of 56Counties in Montana ranked
Series high9,4452025
Series low8,9982020

Population in Stillwater County, 2020 to 2025

CSVChart (SVG)

8,9009,0009,1009,2009,3009,4009,5002020202120222023202420252020: 8,998 persons2021: 9,022 persons2022: 9,186 persons2023: 9,238 persons2024: 9,429 persons2025: 9,445 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
20259,445
20249,429
20239,238
20229,186
20219,022
20208,998

Compared with Montana and United States

Place2025
Stillwater County9,445
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 Stillwater County?

Population in Stillwater County was 9,445 in 2025, according to the U.S. Census Bureau. That is up 0.2% from 2024. That is the 25th 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 Stillwater County?

9,445 in 2025, the highest value since 2020 in this series.

More statistics for Stillwater County

All statistics for Stillwater County