Jefferson County, West Virginia

Founding: 1801
Parent county: Berkeley

Namesake: Thomas Jefferson, U.S. president
Seat: Charles Town (1801–)

Land area: 210 square miles

Population (2020): 57,701

Population (historic): 11,851 (1810); 14,082 (1840); 13,219 (1870); 15,935 (1900); 15,789 (1930)

Periods of population growth: pre-1810–1820; 1830–1850; 1870–1900; 1920–2020

Subdivisions: Two cities; three towns; three CDPs

Pre-1940 residences (estimated): 2,773 (12.2%)
Pre-1940 housing survival rate: 65%
Pre-1860 housing survival rate (1940): 37.6%

Farm housing in disrepair (1950): 13.8%

Nonfarm housing in disrepair (1950): 14.3%

Average farmhouse value (1930): $2,228
Average outbuilding value (1930): $2,109
Average farmhouse size (1940): 6.6 rooms
Number of farms (1920): 899
Average farm size (1920): 119 acres
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Charles Town

Namesake: Charles Washington, local landowner

Founding: 1786 (platting as Charlestown); 1787 (incorporation); 1799 (post office)

Population (2020): 6,534

Population (historic): 1,507 (1850); 1,593 (1870); 2,287 (1890); 2,662 (1910); 2,434 (1930)

Periods of population growth: pre-1850; 1860–1910; 1930–1960; 1980s; 2000–2020
Pre-1940 residences (estimated): 545 (22.5%)
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