Scioto County, Ohio

Founding: 1803
Parent county: Adams

Namesake: The Scioto River
Seats: Alexandria (1803–1805); Portsmouth (1805–)

Land area: 610 square miles

Population (2020): 74,008

Population (historic): 3,399 (1810); 18,428 (1850); 33,511 (1880); 40,981 (1900); 81,221 (1930)

Periods of population growth: pre-1810–1940; 1950s; 1970s; 2000s

Subdivisions: One city; four villages; 10 CDPs; 16 townships

National Register listings: 44

Pre-1940 residences (estimated): 8,527 (25%)
Pre-1940 housing survival rate: 37.9%
Pre-1860 housing survival rate (1940): 16.7%

Farm housing in disrepair (1950): 26.1%

Nonfarm housing in disrepair (1950): 11.3%
Average farmhouse value (1930): $1,030
Average outbuilding value (1930): $750
Average farmhouse size (1940): 4.9 rooms
Number of farms (1920): 2,762
Average farm size (1920): 46.1 acres
Sources of settlement: Virginia, Germany, Pennsylvania, Ireland, and France
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Portsmouth

Namesake: Portsmouth, New Hampshire

Founding: 1803 (platting); 1808 (post office); 1815 (incorporation)

Population (2020): 18,252

Population (historic): 527 (1820); 4,011 (1850); 11,321 (1880); 17,870 (1900); 42,560 (1930)

Periods of population growth: pre-1820–1930
Pre-1940 residences (estimated): 4,721 (47.8%)
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Outstanding Buildings

1. *William Feurt House (c. 1855). 204 Feurt Hill Road. Clay. Classical Revival.
2. *Henry McCall House (1814). 2145 US Highway 52. Nile. Federal.
3. Catt Log House. Cave Lick Road, east of Carey's Run Road. Union. Razed.
4. Davis House (c. 1845). 7845 US Highway 23. Valley. Greek Revival.
5. *Miller House (1802). 15503 US Highway 23. Valley.
6. *George Williamson House (c. 1870). 322 Dry Run Road. Washington. Italianate.
7. *Philip Moore House (1797). 413 State Route 239. Washington.