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

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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