Miami County, Ohio

Founding: 1807
Parent county: Montgomery

Namesake: The Miami River
Seat: Troy (1807–)

Land area: 407 square miles

Population (2020): 108,774

Population (historic): 3,941 (1810); 19,688 (1840); 32,740 (1870); 43,105 (1900); 51,301 (1930)

Periods of population growth: pre-1810–2020

Subdivisions: Three cities; nine villages; 12 townships

National Register listings: 45

Pre-1940 residences (estimated): 10,594 (23.9%)
Pre-1940 housing survival rate: 72%
Pre-1860 housing survival rate (1940): 21.4%

Farm housing in disrepair (1950): 4.2%

Nonfarm housing in disrepair (1950): 5.4%
Average farmhouse value (1930): $1,855
Average outbuilding value (1930): $1,829

Number of farms (1920): 3,260
Average farm size (1920): 66.9 acres
Sources of settlement: Pennsylvania, Virginia, Maryland, Germany, and New Jersey
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Troy

Namesake: The legendary Anatolian city of Troy

Founding: 1807 (platting); 1813 (incorporation)

Population (2020): 26,305

Population (historic): 179 (1810); 1,956 (1850); 3,803 (1880); 5,881 (1900); 8,675 (1930)

Periods of population growth: 1807–2020
Pre-1940 residences (estimated): 2,055 (17.9%)
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Outstanding Buildings

1. James Armstrong Farm (1828). 6770 Bethel–Elizabeth Road. Bethel. Federal.
2. *Elias Staley Farm (1835). 7095 Staley Road. Bethel. Federal.
3. *William Baumgardner House (1857). 8390 US Highway 40. Bethel. Greek Revival.
4. *Samuel Sullivan House (c. 1860). 8787 Sullivan Road. Bethel. Gothic Revival. Razed.
5. *John Dye House (1813). 9 Children's Home Road. Elizabeth.
6. *Stephen Green Farm (c. 1860). 955 Children's Home Road. Elizabeth. Greek Revival.
7. *Andrew Sayers Farm (c. 1850). 1165 Children's Home Road. Elizabeth. Greek Revival.
8. *David Baird Farm (c. 1850). 2590 Dayton–Brandt Road. Elizabeth. Greek Revival.
9. *John Saylor Farm (c. 1830). 3791 Gearhart Road. Elizabeth. Federal.
10. *John Sheets House (1892). 1761 Knoop Road. Elizabeth. Eastlake.
11. *Andrew Sheets House (c. 1820). 4525 McCandliss Road. Elizabeth.
12. *Isaac Sheets House (1841). 3110 State Route 41. Elizabeth. Greek Revival.
13. *Jacob Armstrong Farm (1867). 7815 State Route 41. Elizabeth. Italianate.
14. *Levi Hart Farm (1861). 4163 Walnut Grove Road. Elizabeth. Italianate.
15. *Darius Weddle Farm (1893). 535 Weddle Road. Elizabeth. Queen Anne.
16. Henry Knoop Farm (c. 1890). 3360 State Route 589. Lost Creek. Eastlake.
17. Isaac Heikes Farm (c. 1880). 780 South Hyatt Street. Monroe. Eastlake.
18. Furnas Kerr Farm (c. 1870). 1638 State Route 571. Monroe. Gothic Revival.
19. *John Cassel Farm (1866). 9540 Covington–Gettysburg Road. Newberry. Greek Revival.
20. Jeremiah Fenner Farm (c. 1835). 5845 Fenner Road. Newton. Federal.
21. *Benjamin Iddings Log House (1804). Horseshoe Bend Road. Newton.
22. *John McKee House (1859). 9744 Country Club Road. Spring Creek. Greek Revival.
23. Garbry House (c. 1900). 1367 Garbry Road. Spring Creek. Queen Anne.
24. Mary Widney House (c. 1880). 9382 Piqua–Lockington Road. Spring Creek. Italianate.
25. Mark Knoop House (c. 1875). 1069 Knoop Road. Staunton. Italianate.
26. Asa Coleman Farm (c. 1850). 2249 Piqua–Troy Road. Staunton. Greek Revival.
27. Joseph Hance Farm (c. 1880). 1318 State Route 202. Staunton. Second Empire.
28. Benjamin Enyart Farm (c. 1870). 1646 State Route 202. Staunton. Italianate.
29. Daniel Brown Farm (c. 1845). Piqua–Troy Road, across from Loxley Lane. Staunton. Greek Revival. Razed.
30. *Orrmont / Aaron Orr House (1895). 1612 South Main Street. Washington. Tudor Revival.
31. Mitchell Morrow Farm (c. 1875). 5140 Washington Road. Washington. Italianate.
32. David Statler Farm (c. 1855/1875). 5330 County Road 25A. Washington. Italianate. Razed.
33. *John Johnston Farm (1812–1815). 9845 North Hardin Road. Washington. Federal.
34. *Richard Morrow Farm (c. 1840). 4710 Washington Road. Washington.