Mahoning County, Ohio

Founding: 1846
Parent counties: Columbiana and Trumbull

Namesake: The Mahoning River
Seats: Canfield (1846–1876); Youngstown (1876–)

Land area: 412 square miles

Population (2020): 228,614

Population (historic): 23,735 (1850); 31,001 (1870); 55,979 (1890); 116,151 (1910); 236,142 (1930)

Periods of population growth: pre-1850–1970

Subdivisions: Four cities; six villages; six CDPs; 14 townships

National Register listings: 70

Pre-1940 residences (estimated): 24,624 (22.1%)
Pre-1940 housing survival rate: 40.6%
Pre-1860 housing survival rate (1940): 32.3%

Farm housing in disrepair (1950): 9.7%

Nonfarm housing in disrepair (1950): 5.6%
Average farmhouse value (1930): $2,198
Average outbuilding value (1930): $1,618

Average farmhouse size (1940): 6.7 rooms
Number of farms (1920): 2,555
Average farm size (1920): 53.1 acres
Sources of settlement: Pennsylvania, Ireland, Connecticut, Germany, and New Jersey

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Canfield (ex-seat)

Namesake: Judson Canfield, Connecticut politician

Founding: 1801 (post office); 1849 (incorporation)

Population (2020): 7,699

Population (historic): 527 (1850); 640 (1870); 675 (1890); 685 (1910); 1,015 (1930)

Periods of population growth: pre-1850–1860; 1870–1890; 1900–1980; 1990–2020

Pre-1940 residences (estimated): 222 (6.9%)

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Youngstown

Namesake: John Young, land surveyor

Founding: 1801 (post office); 1848 (incorporation)

Population (2020): 60,068

Population (historic): 273 (1820); 2,802 (1850); 15,435 (1880); 44,885 (1900); 170,002 (1930)

Periods of population growth: pre-1820–1850; 1860–1930; 1940s

Pre-1940 residences (estimated): 13,299 (39.4%)
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Outstanding Buildings

1. *John Gilbert House (c. 1845/1890). 2160 Canfield–Niles Road. Austintown. Greek Revival/Queen Anne.
2. *William Strock House (1830/1928). 7171 Mahoning Avenue. Austintown.
3. Miller House (c. 1875). 11145 Detwiler Road. Beaver. Italianate.
4. Adam Little House (c. 1840). 11180 South Avenue. Beaver. Greek Revival.
5. *Conrad Neff House (1805). 3967 Boardman–Canfield Road. Canfield.
6. *Maple Dell / John Butler Farm (1846). 14737 West Garfield Road. Goshen.
7. *George Armstrong Farm (1823). 15242 Cleveland–East Liverpool Road. Goshen.
8. Naylor Farm (c. 1840). 12308 South Pricetown Road. Goshen.
9. John Orr Farm (1833). 160 South Newton Falls Road. Milton. Federal.
10. *Daniel Vaughn House (1811). 694 Pine Drive. Milton.
11. *Andrew Houston Farm (c. 1865). 2706 Bedford Road. Poland. Italianate.
12. David Arrel House (c. 1870). 3495 Center Road. Poland. Italianate.
13. Heaver Farm (1838). 2830 East Calla Road. Springfield.
14. *Lanterman Mill (1845–1846). 1001 Canfield Road. Youngstown. Greek Revival.