Berkeley County, West Virginia

Founding: 1772
Parent county: Frederick

Namesake: Unclear—either Norborne or William Berkeley, colonial Virginia governors
Seat: Martinsburg (1772–)

Land area: 321 square miles

Population (2020): 122,076

Population (historic): 19,713 (1790); 10,518 (1830); 14,900 (1870); 19,469 (1900); 28,030 (1930)

Periods of population growth: pre-1790–1800; 1830–2020

Subdivisions: One city; one town; two CDPs

Pre-1940 residences (estimated): 3,578 (7.2%)
Pre-1940 housing survival rate: 62.9%
Pre-1860 housing survival rate (1940): 32.3%

Farm housing in disrepair (1950): 8.5%

Nonfarm housing in disrepair (1950): 7.5%

Average farmhouse value (1930): $1,779
Average outbuilding value (1930): $1,475
Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 1,290
Average farm size (1920): 105.8 acres
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Martinsburg

Namesake: Thomas Martin, Virginia politician

Founding: 1770 (platting); 1778 (incorporation); 1792 (post office)

Population (2020): 18,773

Population (historic): 2,190 (1850); 4,863 (1870); 7,226 (1890); 10,698 (1910); 14,857 (1930)

Periods of population growth: pre-1850–1950; 1980–2020
Pre-1940 residences (estimated): 2,709 (32.5%)
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