Guernsey County, Ohio

Founding: 1810
Parent counties: Belmont and Muskingum

Namesake: Guernsey, one of the Channel Islands
Seat: Cambridge (1810–)

Land area: 522 square miles

Population (2020): 38,438

Population (historic): 3,051 (1810); 30,438 (1850); 27,197 (1880); 34,425 (1900); 41,486 (1930)

Periods of population growth: pre-1810–1850; 1870–1920; 1950s; 1970s; 1990s

Subdivisions: One city; eight villages; three CDPs; 19 townships

Pre-1940 residences (estimated): 5,741 (30%)
Pre-1940 housing survival rate: 48.9%
Pre-1860 housing survival rate (1940): 19.4%

Farm housing in disrepair (1950): 11%

Nonfarm housing in disrepair (1950): 9.4%

Average farmhouse value (1930): $953
Average outbuilding value (1930): $665
Average farmhouse size (1940): 5.8 rooms
Number of farms (1920): 3,079
Average farm size (1920): 81.1 acres
Sources of settlement: Pennsylvania, Ireland, Virginia, and Maryland
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Cambridge

Namesake: Unclear—perhaps Cambridge, England; or Cambridge, Massachusetts

Founding: 1806 (platting); 1807 (post office); 1837 (incorporation)

Population (2020): 10,089

Population (historic): 766 (1840); 1,452 (1860); 2,883 (1880); 8,241 (1900); 16,129 (1930)

Periods of population growth: pre-1840–1930
Pre-1940 residences (estimated): 2,255 (43.1%)
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