How many people live in Fergus County, MT?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 11,900 people living in Fergus County, MT. That makes Fergus County the 18th-most populous county in Montana. It is home to 1% of people living in the state.
11.9K
population of Fergus County, MT (2024)
1%
County share of the Montana population (2024)
About 11,900 people lived in Fergus County, MT in 2024.
Population estimates, 2000–2024
What are Fergus County, MT’s age demographics?
About 3,100 Fergus County residents are aged 65 and older in 2024. That represents 25.8% of its population. For comparison, the age group represents 21.1% of Montana’s population and 18% in the US overall.
Another 2,500 Fergus County residents, or 20.7% 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 Fergus County, MT's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Fergus County, MT’s racial and ethnic demographics?
Non-Hispanic white residents make up 92.5% of the Fergus County, MT population, higher than the national share of 57.5%. Fergus County, MT also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (1.5%) than the US overall (0.72%).
In contrast, Fergus County’s Hispanic population accounts for 2.8%, 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.
Fergus 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 Fergus County, MT is Lewistown with about 6,200 residents in 2024.
Cities and towns in Fergus County, MT ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Lewistown | 6,204 |
| 2. | Denton | 212 |
| 3. | Moore | 201 |
| 4. | Winifred | 176 |
| 5. | Grass Range | 115 |
| 6. | Balance of Fergus County | 4,954 |
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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.
