Harford County, Maryland

Founding: 1774
Parent county: Baltimore
Namesake: Henry Harford, Maryland proprietor
Seat: Bel Air (1782–)
Land area: 437 square miles
Population (2020): 260,924
Population (historic): 14,976 (1790); 17,120 (1840); 22,605 (1870); 28,269 (1900); 31,603 (1930)
Periods of population growth: pre-1790–1810; 1820–1860; 1870–1890; 1910–2020
Subdivisions: Two cities; one town; 13 CDPs
Pre-1940 residences (estimated): 4,549 (4.4%)
Pre-1940 housing survival rate: 65.3%
Pre-1860 housing survival rate (1940): 36.1%

Farm housing in disrepair (1950): 10.1%

Nonfarm housing in disrepair (1950): 7.2%

Average farmhouse value (1930): $2,851
Average outbuilding value (1930): $2,406

Average farmhouse size (1940): 6.4 rooms

Number of farms (1920): 2,399
Average farm size (1920): 64.6 acres
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Bel Air

 
Namesake: The French word belleaire ("lovely manner")
Founding: 1780 (platting); 1794 (post office); 1874 (incorporation)
Population (2020): 10,661
Population (historic): 255 (1850); 633 (1870); 1,416 (1890); 1,005 (1910); 1,650 (1930)
Periods of population growth: pre-1850; 1860–1890; 1900–2020
Pre-1940 residences (estimated): 227 (4.4%)
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