Columbia County, Pennsylvania

Founding: 1813
Parent county: Northumberland

Namesake: A reference to Christopher Columbus, Italian explorer
Seat: Danville (1813–1845); Bloomsburg (1845–)

Land area: 483 square miles

Population (2020): 64,727

Population (historic): 17,621 (1820); 17,710 (1850); 28,766 (1870); 39,896 (1900); 48,803 (1930)

Periods of population growth: pre-1820–1840; 1850–1910; 1920–2010

Subdivisions: One town; eight boroughs; 18 CDPs; 18 townships

National Register listings: 32

Pre-1940 residences (estimated): 9,890 (33%)
Pre-1940 housing survival rate: 69.6%
Pre-1860 housing survival rate (1940): 27.8%

Farm housing in disrepair (1950): 9.4%

Nonfarm housing in disrepair (1950): 4.4%
Average farmhouse value (1930): $1,350
Average outbuilding value (1930): $1,347
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,603
Average farm size (1920): 60.1 acres
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Bloomsburg

Namesake: Unclear

Founding: 1802 (platting); 1807 (post office); 1870 (incorporation)

Population (2020): 12,711

Population (historic): 1,626 (1820); 3,122 (1850); 3,341 (1870); 6,170 (1900); 9,093 (1930)

Periods of population growth: pre-1820–1830; 1840s; 1860–1990; 2000s
Pre-1940 residences (estimated): 2,577 (49.9%)
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Outstanding Buildings

1. *West Creek Mill. 261 Beach Glen Road. Benton.
2. *Andrew Freas House (c. 1835). Columbia Boulevard, west of Rittenhouse Mill Road. Briar Creek. Federal. Razed.
3. *Old Stone Methodist Church (1808). Lake Road and Bridge Lane. Briar Creek.
4. Arnold Kester Farm (c. 1855). 1710 Rohrsburg Road. Greenwood. Greek Revival.
5. *William Mather Farm (c. 1855). 2033 Rohrsburg Road. Greenwood. Greek Revival.
6. *Nehemiah Kitchen Farm (1872). 669 Zaner–Rohrsburg Road. Greenwood. Italianate/Gothic Revival.
7. Peter Werkheiser Farm (c. 1855). 265 Dahl Road. Hemlock. Greek Revival.
8. Simon Reichard Farm (c. 1855). 249 Frosty Valley Road. Hemlock. Greek Revival.
9. Brugler Farm (c. 1875). 329 Frosty Valley Road. Hemlock. Italianate.
10. *Roaring Creek Valley Friends Meeting House (1795). Quaker Meeting House Road and Snyder Bridge Road. Locust.
11. *Conrad Kreamer House (c. 1860). 34 White Hall Road. Madison. Greek Revival/Gothic Revival.
12. John Wolf Farm (c. 1835). 800 Mifflin–Nescopeck Highway. Mifflin. Federal.
13. Vanderslice House (c. 1865). 991 Central Road. Scott. Italianate.