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

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.

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