Adams County, Pennsylvania

Founding: 1800
Parent county: York

Namesake: John Adams, U.S. president
Seat: Gettysburg (1800–)

Land area: 519 square miles

Population (2020): 103,852

Population (historic): 13,172 (1800); 23,044 (1840); 30,315 (1870); 34,496 (1900); 37,128 (1930)

Periods of population growth: pre-1800–1900; 1910–2020

Subdivisions: 13 boroughs; 14 CDPs; 21 townships

National Register listings: 37

Pre-1940 residences (estimated): 8,309 (19.6%)
Pre-1940 housing survival rate: 85.8%
Pre-1860 housing survival rate (1940): 33.4%

Farm housing in disrepair (1950): 3%

Nonfarm housing in disrepair (1950): 2.4%
Average farmhouse value (1930): $1,673
Average outbuilding value (1930): $1,554
Average farmhouse size (1940): 7.4 rooms
Number of farms (1920): 3,451
Average farm size (1920): 63.3 acres
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Gettysburg

Namesake: Samuel Gettys, owner of the city site

Founding: 1786 (platting); 1796 (post office); 1806 (incorporation)

Population (2020): 7,106

Population (historic): 1,473 (1830); 3,074 (1870); 3,221 (1890); 4,030 (1910); 5,584 (1930)

Periods of population growth: pre-1830–1870; 1880–1960; 1990–2010
Pre-1940 residences (estimated): 1,503 (57%)
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Outstanding Buildings

1. *Sacred Heart Basilica (1785–1787). 30 Basilica Drive. Conewago. Federal.
2. *Sacred Heart Rectory (1787/1870s). 30 Basilica Drive. Conewago. Second Empire.
3. *Jacob Middlekauff Farm (c. 1805). 530 Flohr's Church Road. Franklin. Federal.
4. *Deardorff House (c. 1790). 2206 Old US Highway 30. Franklin.
5. *Andrew White Farm (c. 1850). 2420 Pumping Station Road. Freedom.
6. *John Byers Farm (c. 1875). 2350 Harney Road. Germany. Italianate.
7. *John Grove Farm (c. 1855). 1246 State Route 194. Hamilton. Greek Revival.
8. *Henry Wolff Farm (c. 1835). 6816 York Road. Hamilton.
9. *James Marshall Farm (c. 1865). 950 Cold Springs Road. Hamiltonban. Italianate.
10. *William Culp Farm (c. 1865). 301 Mount Hope Road. Hamiltonban. Italianate.
11. *Lower Marsh Creek Presbyterian Church (c. 1790). 1865 Knoxlyn Road. Highland. Georgian.
12. *Abraham Trostel Farm (c. 1880). 2008 Idaville–York Springs Road. Huntington. Italianate.
13. *Isaac Deardorff Farm (1786). 160 Latimore Valley Road. Latimore. Georgian.
14. *John Zeigler Farm (1817). 1281 Mountain Road. Latimore. Federal.
15. *Mount Olivet Reformed Church (1871). 265 Two Churches Road. Latimore. Greek Revival/Romanesque.
16. *George Peters Farm (c. 1860). 1219 Carlisle Road. Menallen. Italianate.
17. *Stewart House (c. 1895). 840 Shippensburg Road. Menallen. Queen Anne.
18. *Fleshman Mill. 75 Fleshman Mill Road. Mount Pleasant.
19. *William Jenkins Farm (c. 1820). 586 Irishtown Road. Oxford. Federal.
20. *William Wible Farm (c. 1870). 1465 Old Harrisburg Road. Straban. Italianate.
21. *Great Conewago Presbyterian Church (1787). 174 Red Bridge Road. Straban. Georgian.
22. *Edward Shorb House (c. 1870). 372 Littlestown Road. Union. Italianate.
23. *Solomon Mehring Farm (c. 1865). 144 Mehring Road. Union. Italianate.