How many people live in Mifflin County, PA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 45,900 people living in Mifflin County, PA. That makes Mifflin County the 47th-most populous county in Pennsylvania. It is home to 0.35% of people living in the state.
45.9K
population of Mifflin County, PA (2024)
0.35%
County share of the Pennsylvania population (2024)
About 45,900 people lived in Mifflin County, PA in 2024.
Population estimates, 2000–2024
What are Mifflin County, PA’s age demographics?
About 10,400 Mifflin County, PA residents are aged 65 and older in 2024. That represents 22.6% of its population. For comparison, the age group represents 20.4% of Pennsylvania’s population and 18% in the US overall.
Another 10,200 Mifflin County residents, or 22.3% of the population, were children under 18. For comparison, the age group represents 20.1% of Pennsylvania’s population and 21.6% in the US overall.
A higher share of Mifflin County, PA's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Mifflin County, PA’s racial and ethnic demographics?
Non-Hispanic white residents make up 94.7% of the Mifflin County, PA population, higher than the national share of 57.5%.
In contrast, Mifflin County’s Hispanic population accounts for 2.4%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.91% 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.
Mifflin County, PA has a higher share of a non-Hispanic white population than Pennsylvania as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Mifflin County, PA is Lewistown borough with about 8,400 residents in 2024.
Cities and towns in Mifflin County, PA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Lewistown borough | 8,394 |
| 2. | Derry | 7,226 |
| 3. | Granville | 4,577 |
| 4. | Brown | 4,170 |
| 5. | Armagh | 4,053 |
| 6. | Union | 3,679 |
| 7. | Decatur | 2,926 |
| 8. | Wayne | 2,351 |
| 9. | Oliver | 2,040 |
| 10. | Menno | 2,007 |
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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.
