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

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.

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