Jefferson County, Pennsylvania

Founding: 1830 (declared in 1804)
Parent county: Lycoming

Namesake: Thomas Jefferson, U.S. president
Seat: Brookville (1830–)

Land area: 652 square miles

Population (2020): 44,492

Population (historic): 2,025 (1830); 18,270 (1860); 27,935 (1880); 59,113 (1900); 52,114 (1930)

Periods of population growth: 1810–1910; 1930s; 1970s

Subdivisions: 11 boroughs; one CDP; 23 townships

National Register listings: 15

Pre-1940 residences (estimated): 7,668 (33.9%)
Pre-1940 housing survival rate: 58.9%
Pre-1860 housing survival rate (1940): 8.3%

Farm housing in disrepair (1950): 12.3%

Nonfarm housing in disrepair (1950): 8.8%
Average farmhouse value (1930): $1,295
Average outbuilding value (1930): $1,182
Average farmhouse size (1940): 6.7 rooms
Number of farms (1920): 2,947
Average farm size (1920): 52.3 acres
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Brookville

Namesake: Unknown—likely a descriptive name

Founding: 1830 (platting); 1830 (post office); 1830 (incorporation)

Population (2020): 3,995

Population (historic): 763 (1850); 1,942 (1870); 2,472 (1900); 4,387 (1930)

Periods of population growth: pre-1850–1890; 1900–1940; 1950s; 1970s; 1990s; 2010s
Pre-1940 residences (estimated): 807 (43.1%)
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Outstanding Buildings

1. *Jefferson Chapel Presbyterian Church (c. 1860). 1104 Jefferson Road. Clover. Gothic Revival.
2. *Shields Farm (c. 1860). 51 Olson Lane. Clover. Gothic Revival.
3. *Joseph Knapp House (c. 1870). 15285 State Route 28. Clover.
4. *David Smyers House (c. 1880). 100 Smyers Street. Henderson. Eastlake. Razed.
5. *Norman Lane House (c. 1855). 1390 Broad Street. Snyder. Italianate.