Allendale County, South Carolina

Founding: 1919
Parent counties: Barnwell and Hampton
Namesake: The town of Allendale
Seat: Allendale (1919–)
Land area: 408 square miles
Population (2020): 8,039
Population (historic): 16,098 (1920); 13,294 (1930); 13,040 (1930)
Periods of population growth: pre-1920; 1970–1990
Subdivisions: Four towns
National Register listings: 14
Pre-1940 residences (estimated): 220 (5.4%)
Pre-1940 housing survival rate: 14.4%

Farm housing in disrepair (1950): 37.7%

Nonfarm housing in disrepair (1950): 23%

Average farmhouse value (1930): $451
Average outbuilding value (1930): $248

Average farmhouse size (1940): 4.4 rooms

Number of farms (1920): 1,764
Average farm size (1920): 55.2 acres
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Allendale

 
Namesake: Paul Allen, the town's first postmaster
Founding: 1840s (founding); 1849 (post office); 1873 (platting); 1873 (incorporation)
Population (2020): 2,694
Population (historic): 1,030 (1900); 1,463 (1910); 1,892 (1920); 2,067 (1930)
Periods of population growth: pre-1900–1990
Pre-1940 residences (estimated): 92 (6.3%)
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Outstanding Buildings

1. *Colding–Walker House (c. 1853/1897). 1792 Appleton Road. Eastlake.
2. Belfast (c. 1830). Averill Lane, west of Martin. Federal.
3. *Smyrna Baptist Church (1827). Bluff Road, north of Terry Road. Federal.
4. Cedar Hall / John Cater House (c. 1834). 272 Cedar Hall Road. Federal.
5. *Gravel Hill / Benjamin Willingham House (1857–1859). 220 Gravel Hill Road. Greek Revival.
6. *Erwinton / William Erwin Farm (c. 1828). 4811 River Road. Greek Revival.
7. *Antioch Christian Church (c. 1835). River Road, south of Erwinton.
8. *Roselawn / Joseph Lawton Farm (c. 1837). 187 Seed Place. Greek Revival.