Washington County, Pennsylvania

Founding: 1781
Parent county: Westmoreland

Namesake: George Washington, U.S. president
Seat: Washington (1781–)

Land area: 867 square miles

Population (2020): 209,349

Population (historic): 23,892 (1790); 42,784 (1830); 48,483 (1870); 92,181 (1900); 204,802 (1930)

Periods of population growth: pre-1790–1830; 1840–1940; 1950s; 1970s; 2000–2020

Subdivisions: Two cities; 32 boroughs; 32 CDPs; 34 townships

National Register listings: 100

Pre-1940 residences (estimated): 25,250 (26.5%)
Pre-1940 housing survival rate: 52.5%
Pre-1860 housing survival rate (1940): 27.7%

Farm housing in disrepair (1950): 8.9%

Nonfarm housing in disrepair (1950): 8.3%
Average farmhouse value (1930): $2,454
Average outbuilding value (1930): $1,704
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 4,482
Average farm size (1920): 89.1 acres
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Washington

Namesake: George Washington, U.S. president

Founding: 1781 (platting); 1794 (post office); 1810 (incorporation)

Population (2020): 13,176

Population (historic): 1,301 (1810); 2,062 (1840); 3,571 (1870); 7,670 (1900); 24,545 (1930)

Periods of population growth: pre-1810–1860; 1870–1950
Pre-1940 residences (estimated): 3,157 (47.5%)
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Outstanding Buildings

1. *Samuel Hughes Farm (1806). 320 Lone Pine Road. Amwell.
2. Jacob Shrontz Farm (c. 1821). 1821 McCullough Hill Road. Amwell.
3. *Moses Little Tavern (c. 1840/1845). 438 East National Road. Amwell. Greek Revival.
4. Isaac Hodgens Farm (c. 1855). 44 1st Street. Blaine. Greek Revival/Italianate.
5. Robert McDowell Farm (c. 1845). 2779 Bridge Road. Buffalo. Greek Revival.
6. *Levi Wilson House (1816). 3640 US Highway 40. Buffalo. Federal. Razed.
7. *Enoch Wolf Farm. 1298 Hewitt Avenue. Canton.
8. *Stewart Farm (c. 1850). 927 Lynn–Portal Road. Canton. Greek Revival/Italianate.
9. *John Nesbit Farm (1875). 173 Mulberry Hill Road. Canton.
10. Johnson House (1854). 64 Skylark Drive. Canton. Greek Revival.
11. *James Taggart Farm (1801). 87 Taggart Road. Canton.
12. William Keenan House (c. 1875). 1104 Keenan Road. Carroll. Italianate.
13. *Daniel Van Voorhis House (c. 1785). 710 State Route 481. Carroll. Georgian.
14. *Moore House (c. 1835). 70 Angerer Road. Cecil.
15. *Joseph Reed Farm (c. 1880). 158 Ciaffoni Road. Cecil. Italianate.
16. *Alexander McConnell House (c. 1800). 95 McConnell Road. Cecil. Georgian.
17. *John White House (1806). 2151 North Main Street. Chartiers.
18. James Stewart Farm (c. 1850). 85 Ryburn Road. Chartiers. Greek Revival.
19. *Patterson House (c. 1855). 122 Paris Road. Cross Creek.
20. Beall House (c. 1810). 1263 Crawford Road. East Bethlehem. Federal.
21. *Welsh–Emery House (c. 1815/1878/1909). 38 Emery Road. East Bethlehem. Classical Revival.
22. Miller House (c. 1845). 9 Huffman Road. East Bethlehem.
23. House (c. 1875). 2566 National Pike. East Bethlehem. Italianate.
24. *Joseph Harrison House (c. 1845/1875). Old National Pike, west of Tate Road. East Bethlehem. Italianate. Razed.
25. *Thomas Martindale Farm (1861). 20 Ruscitto Lane. East Bethlehem. Italianate.
26. *Malden Inn (1822/1830). 384 Old National Pike. East Pike Run.
27. *Solomon Phillips Farm (c. 1820). 616 Washington Street. East Pike Run. Federal.
28. *John Nelson House (c. 1895). 104 Colvin Road. Fallowfield. Queen Anne.
29. *Isaac Manchester Farm (1815). 52 Manchester Lane. Independence. Georgian.
30. *Farm (c. 1890). 1656 Miller's Run Road. Mount Pleasant. Eastlake.
31. *Andrew Russell House (c. 1875). 150 Water Dam Road. Mount Pleasant. Italianate.
32. *Demas Letherman Farm (1871). 369 Letherman Bridge Road. North Bethlehem. Italianate.
33. *Philip Friend Farm (c. 1807). 105 Little Daniels Run Road. North Bethlehem. Federal.
34. *Samuel Brownlee House (1846). 1253 State Route 519. North Strabane. Greek Revival.
35. *David Quail House (1832). 1445 Washington Road. North Strabane. Federal.
36. Isaac Sumney Log House. Sugar Run Road, south of Meadowbrook Road. Nottingham. Razed.
37. *Gamble House (c. 1890). 3 Valley View Road. Nottingham. Eastlake.
38. Townsend House (c. 1845). 378 McComb's Road. Peters. Greek Revival.
39. *Enoch Wright House (c. 1815). 815 Venetia Road. Peters. Federal.
40. *John Clark House (1898). 185 Old Plank Road. South Franklin. Queen Anne.
41. *Harvey Clark House (1857). 2085 Park Avenue. South Franklin. Italianate.
42. *Matthew Martin Farm (1883–1884). 1989 East Beau Street. South Strabane. Italianate.
43. *Amos Walton Farm (c. 1855). 484 Highland Ridge Road. West Bethlehem. Italianate.
44. James Weaver Farm (1879). 22 Kefover Road. West Bethlehem. Italianate.
45. House (c. 1860). 960 Maiden Street. West Pike Run. Italianate.
46. *Knight–Taylor House (c. 1790/1878). 686 National Pike. West Pike Run. Second Empire.