County Maps US

Mifflin County, Pennsylvania

A county in Pennsylvania, ranked 47 of 67 by population.

CountyFIPS 42087

Within Pennsylvania
Mifflin County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Lewistown, the county seat, located via the 2025 Census Gazetteer.

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Population
46,127
-17 (0%) since 2020
Land area
411
square miles. A further 0.9% of the total area is water
Population density
112
people per square mile, computed rather than published
County seat
Lewistown
Seat of county government.
Established
1789
236 years ago
Largest city
Lewistown borough
Population 8,385.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Mifflin County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Mifflin County, Pennsylvania from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 784 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Mifflin County ranks

Position among the 67 counties of Pennsylvania, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn PennsylvaniaNationally
Population46,12747th of 671,071st of 3,144
Land area411 sq mi54th of 672,461st of 3,144
Population density112 per sq mi39th of 67840th of 3,144
Median household income$63,95341st of 671,712th of 3,143

Full data for Mifflin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population46,127Vintage 2025 Population Estimates
Population in 202046,144Vintage 2025 Population Estimates
2020 estimates base?46,138Vintage 2025 Population Estimates
Land area411 sq mi2025 Gazetteer Files
Water area3.7 sq mi2025 Gazetteer Files
Total area414.7 sq mi2025 Gazetteer Files
Population density?112 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$63,953American Community Survey 2020-2024 5-Year Estimates
Median home value$156,700American Community Survey 2020-2024 5-Year Estimates
Median age43.4American Community Survey 2020-2024 5-Year Estimates
Households18,510American Community Survey 2020-2024 5-Year Estimates
Housing units21,468American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-23
587 births, 610 deaths
Net migration
+126
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Mifflin County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Huntingdon CountyPennsylvania43 mi43,001
Juniata CountyPennsylvania35 mi23,403
Centre CountyPennsylvania19 mi157,393
Snyder CountyPennsylvania11 mi39,655
Union CountyPennsylvania3.0 mi42,313

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 67 counties of Pennsylvania

Open the interactive Pennsylvania county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.