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

National Register listings: Nine

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.