Lehigh County, Pennsylvania

Founding: 1812
Parent county: Northampton

Namesake: The Lehigh River
Seat: Allentown (1812–)

Land area: 345 square miles

Population (2020): 374,557

Population (historic): 18,895 (1820); 32,479 (1850); 56,796 (1870); 93,893 (1900); 172,893 (1930)

Periods of population growth: pre-1820–2020

Subdivisions: One city; eight boroughs; 12 CDPs; 15 townships

Pre-1940 residences (estimated): 35,521 (24.2%)
Pre-1940 housing survival rate: 77.7%
Pre-1860 housing survival rate (1940): 32.9%

Farm housing in disrepair (1950): 5%

Nonfarm housing in disrepair (1950): 2.5%
Average farmhouse value (1930): $2,651
Average outbuilding value (1930): $2,912
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 2,959
Average farm size (1920): 52.2 acres
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Allentown

Namesake: William Allen, Philadelphia merchant

Founding: 1762 (platting as Northampton); 1803 (post office); 1811 (incorporation)

Population (2020): 125,845

Population (historic): 486 (1790); 1,757 (1830); 13,884 (1870); 35,416 (1900); 92,563 (1930)

Periods of population growth: pre-1790–1970; 1980–2020
Pre-1940 residences (estimated): 18,686 (40.1%)
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