How many people live in Sheridan County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 3,400 people living in Sheridan County, MT. That makes Sheridan County the 41st-most populous county in Montana. It is home to 0.3% of people living in the state.
3.45K
population of Sheridan County, MT (2024)
0.3%
County share of the Montana population (2024)
About 3,400 people lived in Sheridan County, MT in 2024.
Population estimates, 2000–2024
What are Sheridan County, MT’s age demographics?
About 882 Sheridan County, MT residents are aged 65 and older in 2024. That represents 25.6% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 702 Sheridan County residents, or 20.4% of the population, were children under 18. For comparison, the age group represents 20.5% of Montana’s population and 21.6% in the US overall.
A higher share of Sheridan County, MT's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Sheridan County, MT’s racial and ethnic demographics?
Non-Hispanic white residents make up 89.6% of the Sheridan County, MT population, higher than the national share of 57.5%. Sheridan County, MT also has a larger share of people identifying as non-Hispanic two or more races (2.6%) than the US overall (2.5%).
In contrast, Sheridan County’s Hispanic population accounts for 4.2%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.35% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Sheridan County, MT has a higher share of a non-Hispanic white population than Montana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Sheridan County, MT is Plentywood with about 1,600 residents in 2024.
Cities and towns in Sheridan County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Plentywood | 1,626 |
| 2. | Medicine Lake | 240 |
| 3. | Westby | 162 |
| 4. | Outlook | 80 |
| 5. | Balance of Sheridan County | 1,340 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
