Data / Population / Yellowstone County

Population in Yellowstone County

Population in Yellowstone County was 172,692 in 2025, according to the U.S. Census Bureau. That is up 0.7% from 2024. That is the 1st highest of 56 counties in 2025.

2025, persons172,692
Change on 2024+0.7%
Rank1st of 56Counties in Montana ranked
Series high172,6922025
Series low165,2082020

Population in Yellowstone County, 2020 to 2025

CSVChart (SVG)

164K166K168K170K172K174K2020202120222023202420252020: 165,208 persons2021: 167,444 persons2022: 169,743 persons2023: 170,568 persons2024: 171,548 persons2025: 172,692 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
2025172,692
2024171,548
2023170,568
2022169,743
2021167,444
2020165,208

Compared with Montana and United States

Place2025
Yellowstone County172,692
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 Yellowstone County?

Population in Yellowstone County was 172,692 in 2025, according to the U.S. Census Bureau. That is up 0.7% from 2024. That is the 1st 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 Yellowstone County?

172,692 in 2025, the highest value since 2020 in this series.

More statistics for Yellowstone County

All statistics for Yellowstone County