Mifflin County, Pennsylvania

Founding: 1789
Parent counties: Cumberland and Northumberland

Namesake: Thomas Mifflin, Pennsylvania governor
Seat: Lewistown (1790–)

Land area: 411 square miles

Population (2020): 46,143

Population (historic): 7,562 (1790); 21,690 (1830); 16,340 (1860); 19,996 (1890); 40,335 (1930)

Periods of population growth: pre-1790–1810; 1810–1830; 1840–1980; 1990–2010

Subdivisions: Six boroughs; 20 CDPs; ten townships

Pre-1940 residences (estimated): 5,833 (26.8%)
Pre-1940 housing survival rate: 63.6%
Pre-1860 housing survival rate (1940): 31.8%

Farm housing in disrepair (1950): 12.2%

Nonfarm housing in disrepair (1950): 8.9%
Average farmhouse value (1930): $1,826
Average outbuilding value (1930): $1,884
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 1,108
Average farm size (1920): 79.1 acres
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Lewistown

Namesake: William Lewis, platter

Founding: 1790 (platting); 1795 (incorporation); 1797 (post office)

Population (2020): 8,561

Population (historic): 523 (1800); 1,479 (1830); 2,638 (1860); 3,273 (1890); 13,357 (1930)

Periods of population growth: 1790s; 1810–1850; 1860–1930; 1940s; 2010s
Pre-1940 residences (estimated): 1,867 (44.6%)
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Outstanding Buildings

1. David Glick Farm (c. 1840). 932 Jack's Creek Road. Derry. Federal.
2. George Foulk House (1829). US Highway 22, southeast of Lewistown. Derry.
3. Reuben Myers Farm (c. 1855). 10762 Ferguson Valley Road. Granville. Federal.
4. Brought House (c. 1885). 1537 Loop Road. Granville. Italianate/Eastlake.
5. Reuben Myers Farm (c. 1835). 7332 Ferguson Valley Road. Oliver.
6. Clark House (c. 1830). 825 Furnace Road. Oliver. Federal.
7. Bell House (c. 1835). US Highway 22 and Hidden Acres Drive. Oliver. Federal. Razed.
8. Adolphus Gibboney House. 788 Dry House Road. Union. Georgian.
9. James Alexander Farm (c. 1765/1861). 50 Alexander Circle. Union.
10. James Alexander Farm (c. 1790/1830). 5518 State Route 655. Union. Greek Revival.

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