Washington County, Ohio

Founding: 1788
Parent county: Unorganized territory

Namesake: George Washington, U.S. president
Seat: Marietta (1788–)

Land area: 632 square miles

Population (2020): 59,711

Population (historic): 5,427 (1800); 20,823 (1840); 43,244 (1880); 48,245 (1900); 42,437 (1930)

Periods of population growth: pre-1800–1880; 1890s; 1930–1980; 1990s

Subdivisions: Two cities; five villages; six CDPs; 22 townships

National Register listings: 37

Pre-1940 residences (estimated): 6,164 (21.9%)
Pre-1940 housing survival rate: 52.6%
Pre-1860 housing survival rate (1940): 14.1%

Farm housing in disrepair (1950): 11.7%

Nonfarm housing in disrepair (1950): 10.8%

Average farmhouse value (1930): $963
Average outbuilding value (1930): $658
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 4,204
Average farm size (1920): 57.6 acres
Sources of settlement: Germany, Pennsylvania, Virginia, Connecticut, New York, and Scotland
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Marietta

Namesake: Unclear—perhaps Marie Antoinette, French queen

Founding: 1788 (platting); 1794 (post office)

Population (2020): 13,385

Population (historic): 321 (1800); 3,175 (1850); 5,444 (1880); 13,348 (1900); 14,285 (1930)

Periods of population growth: 1788–1900; 1910s; 1930–1960
Pre-1940 residences (estimated): 2,913 (45.1%)
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Outstanding Buildings

1. William Long Log House. 1335 Cat's Creek Road. Adams.
2. *Jonathan Sprague House (1800). 12091 Muskingum River Road. Adams.
3. John Mason Farm (c. 1830). 14430 State Route 60. Adams. Federal.
4. *Jonathan Stone House (1799). 612 Blennerhasset Avenue. Belpre. Federal.
5. *Walter Curtis Farm (1827). 851 Newbury Road. Belpre.
6. *William Smith House (1870). 8768 State Route 55. Decatur.
7. Richard Irvine House (c. 1860). 561 Veto Road. Decatur.
8. *Francis Collins Farm (c. 1855). 49995 State Route 7. Grandview. Italianate.
9. *Ernst Waernicke Farm (1864). 1375 Upper Archer's Fork Road. Independence. Greek Revival.
10. *William Hune House (1865/1878). 18445 State Route 26. Lawrence. Greek Revival.
11. *Charles Cisler House (1879). 1206 Glendale Road. Marietta. Eastlake.
12. *Baldwin House (1815/1835). 350 Ash Road. Muskingum. Federal.
13. *Russell House (c. 1820). 545 Masonic Park Lane. Muskingum. Federal.
14. *Joseph Barker House (1811). 1903 Masonic Park Lane. Muskingum. Federal.
15. *James Wood Farm (c. 1840). 3800 Muskingum River Road. Muskingum. Greek Revival.
16. *Chamberlain House (1904). 6 Ness Place. Muskingum. Classical Revival.
17. *Lowell House (c. 1895). 4340 State Route 60. Muskingum. Classical Revival.
18. *Daniel Greene House (c. 1825). 38484 State Route 7. Newport. Federal.
19. *Joseph Barker House (1832). State Route 7. Newport. Federal.
20. *Robert Hanna Log House. 704 Bender Road. Warren.
21. *Augustus Bailey House (c. 1855). 1300 Blue Knob Road. Warren. Italianate/Gothic Revival.
22. Benjamin Dana House (1818). 18206 State Route 60. Waterford. Federal.
23. George Gordon Farm (c. 1855). 1485 State Route 83. Waterford.
24. *Simeon Deming House (1815). 525 Kern Road. Watertown. Federal.
25. St. John Catholic Church (1866–1867). 17784 State Route 676. Watertown. Romanesque.