Dauphin County, Pennsylvania

Founding: 1785
Parent county: Lancaster

Namesake: Louis Joseph, Dauphin of France
Seat: Harrisburg (1785–)

Land area: 525 square miles

Population (2020): 286,401

Population (historic): 18,155 (1790); 25,243 (1830); 60,740 (1870); 114,443 (1900); 165,231 (1930)

Periods of population growth: pre-1790–1810; 1820–2020

Subdivisions: One city; 16 boroughs; 15 CDPs; 23 townships

Pre-1940 residences (estimated): 27,229 (22.1%)
Pre-1940 housing survival rate: 51.1%
Pre-1860 housing survival rate (1940): 24.7%

Farm housing in disrepair (1950): 5.8%

Nonfarm housing in disrepair (1950): 4.6%
Average farmhouse value (1930): $2,046
Average outbuilding value (1930): $1,810
Average farmhouse size (1940): 7.1 rooms
Number of farms (1920): 2,517
Average farm size (1920): 67.6 acres
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Harrisburg

Namesake: John Harris, local settler

Founding: 1719 (founding); 1791 (incorporation); 1792 (post office)

Population (2020): 50,099

Population (historic): 875 (1790); 4,312 (1830); 23,104 (1870); 50,167 (1900); 80,339 (1930)

Periods of population growth: pre-1790–1950; 2000–2020
Pre-1940 residences (estimated): 11,774 (47%)
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