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

National Register listings: 30

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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Outstanding Buildings

1. *Peter Yeager Inn (c. 1830). 2125 State Route 54. Coal.
2. *George Hopper House (c. 1795). 700 8th Street. Delaware. Georgian.
3. *William Kirk Farm (1828/1870s). 3355 8th Street. Delaware. Federal/Italianate.
4. *Warrior Run Presbyterian Church (1835). 4505 Susquehanna Trail. Delaware. Greek Revival.
5. *Enoch Hower Farm (c. 1845). 246 Warrior Run Road. Lewis.
6. *Casper Snyder House (1798/1860s). 8087 Smiles Road. Lower Augusta. Italianate.
7. Northumberland County Infirmary. 1810 Snydertown Road. Lower Augusta.
8. *Mertz House (1876). 102 Greenhouse Road. Point. Italianate.
9. *Jacob Leisenring Tavern (1812). 2582 State Route 54. Ralpho. Georgian.
10. *Zion Lutheran Church (1814–1816). 115 Trout Lane. Rockefeller. Federal.
11. Irvin Torrence House (c. 1870). 1302 Blue Hill Drive. Rush. Italianate.
12. David Ireland Farm (c. 1855). 149 North Ridge Road. Turbot. Greek Revival/Italianate.
13. Paradise Reformed Church (c. 1855). 8105 Paradise Road. Turbot. Greek Revival/Gothic Revival.
14. Farm (c. 1895). 878 Snydertown Road. Upper Augusta. Queen Anne.
15. *Penrose Eisenbrown House (1871). 2912 Schwaben Creek Road. Washington. Gothic Revival.
16. *Frederick Farm (c. 1856). 4855 State Route 45. West Chillisquaque. Italianate.
17. *Sodom School (c. 1835). State Route 45, east of Covered Bridge Road. West Chillisquaque.
18. Samuel Ransom House (c. 1820). 4260 State Route 405. West Chillisquaque. Federal.
19. *James Cameron House (c. 1840/1860). 5340 State Route 405. West Chillisquaque. Federal/Italianate.