Montgomery County, Ohio

Founding: 1803
Parent county: Hamilton

Namesake: Richard Montgomery, Continental Army general
Seat: Dayton (1803–)

Land area: 462 square miles

Population (2020): 537,309

Population (historic): 7,722 (1810); 31,938 (1840); 64,006 (1870); 130,146 (1900); 273,481 (1930)

Periods of population growth: pre-1810–1970

Subdivisions: 17 cities; five villages; one CDP; nine townships

National Register listings: 157

Pre-1940 residences (estimated): 41,989 (16.5%)
Pre-1940 housing survival rate: 48.3%
Pre-1860 housing survival rate (1940): 26.2%

Farm housing in disrepair (1950): 3.4%

Nonfarm housing in disrepair (1950): 5.1%
Average farmhouse value (1930): $2,480
Average outbuilding value (1930): $1,784

Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 4,460
Average farm size (1920): 49.6 acres
Sources of settlement: Pennsylvania, Maryland, Germany, Virginia, and New Jersey
_________________________________________________________________________________

Dayton

Namesake: Jonathan Dayton, New Jersey politician

Founding: 1796 (platting); 1803 (post office); 1805 (incorporation)

Population (2020): 137,644

Population (historic): 383 (1810); 6,067 (1840); 30,473 (1870); 85,333 (1900); 200,982 (1930)

Periods of population growth: pre-1810–1960
Pre-1940 residences (estimated): 29,264 (39.2%)
_________________________________________________________________________________

View and filter the data. Or see a larger map.
_________________________________________________________________________________

Outstanding Buildings

1. *John Furnas House (c. 1845). 1269 Furnas Road. Butler.
2. *John Beard Farm (1846). 3677 Mulberry Road. Butler. Razed.
3. *James Patty House (c. 1845). Patty's Road, west of Frederick Pike. Butler. Razed.
4. *Jacob Lasure House (1863). 241 Arlington Road. Clay.
5. *David Rohr House (1873/1890s). 1201 West Market Street. German. Italianate/Queen Anne.
6. *John Stump Farm (1817). 11345 Oxford Road. German. Federal.
7. *Jacob Koehne House (1853). 11011 State Route 725. German. Greek Revival.
8. *Daniel Miller House (1808). 3525 Courtwood Avenue. Harrison. Federal.
9. Joseph Kennedy House (c. 1845). 5180 Frederick Pike. Harrison. Greek Revival. Ruined.
10. *Jacob Mumma House (c. 1865). 2239 Kipling Drive. Harrison.
11. *Daniel Recher Farm (c. 1835/1875). 7275 Dayton–Farmersville Road. Jefferson. Italianate.
12. *Lewis Kemp House (1806/1832). 4800 Burkhardt Road. Mad River.
13. *George Harshman House (c. 1855). 5201 Hubertville Avenue. Mad River. Greek Revival.
14. David Heck House (c. 1840). 9537 Dayton Pike. Madison. Greek Revival.
15. *John Fryman House (1831). 3300 Diamond Mill Road. Madison.
16. *Farm (c. 1875). 7835 Old Dayton Road. Madison. Italianate.
17. Farm (c. 1890). 7680 Wolf Creek Pike. Madison. Italianate/Queen Anne.
18. *Joseph Snyder House (c. 1835). Wolf Creek Pike. Madison. Classical Revival. Razed.
19. *Robert Mitchell House (c. 1875). 2673 Austin Road. Miami. Second Empire. Razed.
20. *Jacob Overholser Farm (c. 1840). 9630 Diamond Mill Road. Randolph.
21. *Benjamin Krug House (1880). 3473 Sweet Potato Ridge Road. Randolph.
22. *Jonathan Watkins House (c. 1804/1812). 9950 Lebanon Pike. Washington.
23. *John Harris House (c. 1810). 1243 East Social Row Road. Washington.
24. *Robert Bradford House (1839). 1284 East Social Row Road. Washington. Federal.
25. *Daniel Arnold Farm (1836). 7800 Shull Road. Wayne. Federal.
26. *Joseph Arnold Farm (c. 1845). 7900 Shull Road. Wayne.
27. *Joseph McElhenney House (1874). 7373 Taylorsville Road. Wayne. Gothic Revival.