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

National Register listings: 77

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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Outstanding Buildings

1. Abraham Redsecker Farm. 2405 Mill Road. Conewago.
2. *Milton Hershey Estate (1908). 100 Mansion Road. Derry. Classical Revival.
3. Abraham Strickler House. Middletown Road and Princeton Drive. Derry. Georgian. Razed.
4. *William Earley Farm (c. 1815). 843 Early's Mill Road. East Hanover. Federal.
5. *John Todd House (c. 1772). 412 South Meadow Lane. East Hanover. Georgian.
6. Christian Urich House (c. 1825). 41 Ridge Road. Halifax. Federal.
7. James Freeland House (c. 1835). 1347 River Road. Halifax. Federal/Greek Revival.
8. *Henry Smith Farm (1806/1840). 950 Swatara Creek Road. Londonderry.
9. *George Hain House (c. 1880). 4041 Valley Road. Lower Paxton. Second Empire.
10. *Conrad Allerman House (1788/1800). 1412 Farmhouse Lane. Lower Swatara.
11. House (c. 1895). 1260 Lumber Street. Lower Swatara. Queen Anne.
12. *John Ayres House (c. 1805). 1801 Peters Mountain Road. Middle Paxton. Georgian.
13. William Deibler Farm (c. 1880). 380 North Pine Street. Mifflin. Second Empire.
14. *Tavern. 100 Fort Hunter Road. Susquehanna. Italianate.
15. *Archibald McAllister House (1814). 5300 North Front Street. Susquehanna. Federal.
16. George Hain House. 3906 Schoolhouse Lane. Susquehanna.
17. John Kramer House. 7500 Jonestown Road. West Hanover. Georgian.
18. John Rauch House. 7700 Jonestown Road. West Hanover. Georgian.