Northumberland County, Pennsylvania

Founding: 1772
Parent counties: Bedford, Berks, Cumberland, Lancaster, and Northampton

Namesake: Northumberland, England
Seat: Sunbury (1772–)

Land area: 458 square miles

Population (2020): 91,647

Population (historic): 17,147 (1790); 18,133 (1830); 28,922 (1860); 90,911 (1900); 128,504 (1930)

Periods of population growth: pre-1790–1930; 1970s

Subdivisions: Two cities; 11 boroughs; 14 CDPs; 23 townships

Pre-1940 residences (estimated): 18,850 (41.5%)
Pre-1940 housing survival rate: 65.4%
Pre-1860 housing survival rate (1940): 18%

Farm housing in disrepair (1950): 10.3%

Nonfarm housing in disrepair (1950): 5.9%
Average farmhouse value (1930): $1,577
Average outbuilding value (1930): $1,655
Average farmhouse size (1940): 7.1 rooms
Number of farms (1920): 2,589
Average farm size (1920): 63.1 acres
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Sunbury

Namesake: Sunbury-on-Thames, England

Founding: 1772 (platting); 1795 (post office); 1797 (incorporation)

Population (2020): 9,719

Population (historic): 613 (1800); 1,036 (1830); 1,803 (1860); 5,930 (1890); 15,626 (1930)

Periods of population growth: pre-1800–1920
Pre-1940 residences (estimated): 2,616 (57.8%)
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