Delaware County, Ohio

Founding: 1808
Parent county: Franklin

Namesake: The Delaware (Lenape) people
Seat: Delaware (1808–)

Land area: 443 square miles

Population (2020): 214,124

Population (historic): 2,000 (1810); 21,817 (1850); 27,381 (1880); 26,016 (1930)

Periods of population growth: 1810–1840; 1850–1880; 1940–2020

Subdivisions: Three cities; five villages; two CDPs; 18 townships

National Register listings: 60

Pre-1940 residences (estimated): 4,771 (7%)
Pre-1940 housing survival rate: 64.4%
Pre-1860 housing survival rate (1940): 15.4%

Farm housing in disrepair (1950): 4.1%

Nonfarm housing in disrepair (1950): 6.7%
Average farmhouse value (1930): $1,677
Average outbuilding value (1930): $1,298
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,922
Average farm size (1920): 78.6 acres
Sources of settlement: Pennsylvania, New York, Virginia, New Jersey, Connecticut, and Wales
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Delaware

Namesake: The Delaware (Lenape) people

Founding: 1808 (platting); 1811 (post office); 1816 (incorporation)

Population (2020): 41,302

Population (historic): 200 (1810); 2,074 (1850); 6,894 (1880); 8,675 (1930)

Periods of population growth: 1810–1890; 1900s; 1940–1980; 1990–
Pre-1940 residences (estimated): 1,967 (13%)
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Outstanding Buildings

1. Charles Gregory House (c. 1830). 423 South Galena Road. Berkshire.
2. *McKitrick–Marsh House (c. 1855/1880). 7770 Dublin Road. Concord. Greek Revival/Gothic Revival.
3. William Siegfried Farm (c. 1875). 175 Hudson Road. Delaware. Italianate.
4. *Forrest Meeker Farm (1823). 2690 Stratford Road. Delaware. Federal.
5. *Crist Tavern Annex (c. 1835). 2966 Olentangy River Road. Delaware.
6. *Oakwood / John Vergon Farm (c. 1854). 479 US Highway 42. Delaware. Gothic Revival.
7. *Diadatus Keeler House (1833). 4567 Red Bank Road. Genoa.
8. John Roberts House (c. 1830). 3584 Sunbury Road. Genoa. Federal.
9. *Marcus Curtiss Inn (1822). 3860 Sunbury Road. Genoa. Federal.
10. *John Cook Farm (1863). 12040 Gorsuch Road. Harlem. Italianate.
11. Ransom Keeler Farm (c. 1860). 4987 Harlem Road. Harlem. Gothic Revival.
12. John Williams House (c. 1860). 6962 Harlem Road. Harlem. Greek Revival/Gothic Revival.
13. Alfred Van Sickle House (c. 1860). 2597 North Galena Road. Kingston. Gothic Revival.
14. Jacob Sealey House (c. 1875). 2835 Bunty Station Road. Liberty. Gothic Revival.
15. *Bieber Mill Ruins (1873). Chapman Road, north of Winter Road. Liberty.
16. Newton Harris Farm (c. 1876). 3350 Clark–Shaw Road. Liberty. Italianate.
17. *Daniel Stout House (1854). 3490 Olentangy River Road. Liberty.
18. *Rollin Willis House (1884). 6509 Olentangy River Road. Liberty. Eastlake.
19. *House (remodeled c. 1855). 9826 Olentangy River Road. Liberty.
20. William Case House (1872). 9890 Olentangy River Road. Liberty. Italianate.
21. *School (c. 1895). 6711 Steitz Road. Liberty. Eastlake.
22. *Samuel Sharp House (c. 1867). 7435 Horseshoe Road. Marlboro. Greek Revival/Italianate.
23. *George Gooding Tavern (1827/1854). 7669 Stager's Loop. Orange. Italianate.
24. *Abraham Peters Farm (c. 1870). 9019 Peters Road. Oxford. Gothic Revival.
25. *Lawrence Harrison Farm (c. 1870). 7119 State Route 61. Porter. Gothic Revival.
26. *Benjamin David House (c. 1873). 5511 David Road. Radnor. Italianate.
27. *William Dildine Farm (c. 1875). 4522 Dildine Road. Radnor. Second Empire.
28. Nathaniel Hodges House (c. 1865). 153 Hodges Road. Radnor. Gothic Revival.
29. *Samuel Perry Farm (c. 1820). 695 Lawrence Road. Radnor.
30. *John Utz Farm (1885). 4096 River Road. Radnor. Italianate.
31. *Elijah Adams House (c. 1830). 6230 State Route 203. Radnor.
32. *Thomas Warren Farm (1848). 3376 Marysville Road. Scioto. Federal.
33. *Israel Waters House (1842). 6595 State Route 257. Thompson. Federal.
34. *Gilbert Van Dorn House (1829). 14659 State Route 37. Trenton. Federal.
35. Edward Dent House (c. 1875). 15519 State Route 37. Trenton. Second Empire.
36. Samuel Willey House (c. 1830). Willey Road. Troy. Razed.