Union County, Pennsylvania

Founding: 1813
Parent county: Northumberland

Namesake: A traditional name
Seat: New Berlin (1813–1855); Lewisburg (1855–)

Land area: 316 square miles

Population (2020): 42,681

Population (historic): 18,619 (1820); 26,083 (1850); 16,905 (1880); 17,592 (1900); 17,468 (1930)

Periods of population growth: pre-1820–1850; 1860–1890; 1920–2010

Subdivisions: Four boroughs; seven CDPs; ten townships

National Register listings: 20

Pre-1940 residences (estimated): 3,976 (23%)
Pre-1940 housing survival rate: 82.4%
Pre-1860 housing survival rate (1940): 26.4%

Farm housing in disrepair (1950): 7.7%

Nonfarm housing in disrepair (1950): 5%
Average farmhouse value (1930): $1,694
Average outbuilding value (1930): $1,652
Average farmhouse size (1940): 7.3 rooms
Number of farms (1920): 1,411
Average farm size (1920): 61.1 acres
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Lewisburg

Namesake: Unknown

Founding: 1784 (platting); 1812 (incorporation); 1813 (post office)

Population (2020): 5,158

Population (historic): 914 (1830); 2,666 (1860); 3,080 (1880); 3,457 (1900); 3,308 (1930)

Periods of population growth: pre-1830–1870; 1880–1900; 1910–1970; 1980s; 2000s
Pre-1940 residences (estimated): 780 (34.6%)
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Outstanding Buildings

1. Joseph Shriner House (c. 1875). 426 Airport Road. Buffalo. Italianate.
2. Johnson Walls Farm (c. 1875). 1530 Buffalo Road. Buffalo. Italianate.
3. *Abraham Wolfe House (c. 1787/1810). 2530 Buffalo Road. Buffalo.
4. *Andrew Rishel Farm (c. 1820/1829). 3400 Buffalo Road. Buffalo. Federal.
5. Baker Farm (c. 1830). 6374 Buffalo Road. Buffalo. Federal.
6. Pontius Farm (c. 1875). 34 Buffalo Creek Road. Buffalo. Italianate.
7. Thomas Penny House (c. 1830). 943 Hardscrabble Lane. East Buffalo. Federal.
8. Ellis Frederick House (c. 1870). 2167 Old Turnpike Road. East Buffalo. Italianate. Razed.
9. *Benjamin Griffey House (c. 1886). 162 State Route 44. Gregg. Italianate. Razed.
10. Log House. 16685 Old Turnpike Road. Hartley.
11. Van Valzah Farm (c. 1835). 3013 Hoffa Mill Road. Kelly. Federal/Italianate.
12. Farm (c. 1885). 4518 John Kelly Road. Kelly. Italianate.
13. *Eli Slifer House (1861). 130 Magnolia Drive. Kelly. Italianate/Gothic Revival.
14. Thomas Clingan Farm (c. 1810). 1653 Straw Bridge Road. Kelly. Federal.
15. House (c. 1880). 1006 William Penn Drive. Kelly. Italianate/Eastlake.
16. *George Spangler Farm (1802). 1175 Wildwood Road. Limestone.
17. Roland McCurley Farm (c. 1870). 1823 Old US Highway 15. White Deer. Italianate.