Allen County, Ohio

Founding: 1831 (declared in 1820)
Parent county: Unorganized territory

Namesake: John Allen, Virginia soldier
Seat: Lima (1831–)

Land area: 402 square miles

Population (2020): 102,206

Population (historic): 9,079 (1840); 19,185 (1860); 31,314 (1880); 47,976 (1900); 69,419 (1930)

Periods of population growth: 1830–1920; 1940–1960

Subdivisions: Two cities; seven villages; one CDP; 12 townships

National Register listings: 30

Pre-1940 residences (estimated): 10,187 (22.7%)
Pre-1940 housing survival rate: 51.5%
Pre-1860 housing survival rate (1940): 6.6%

Farm housing in disrepair (1950): 5.4%

Nonfarm housing in disrepair (1950): 5.6%

Average farmhouse value (1930): $1,361
Average outbuilding value (1930): $1,330
Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 2,909
Average farm size (1920): 70.7 acres
Sources of settlement: Pennsylvania, Germany, Wales, Virginia, Maryland, and Switzerland
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Lima

Namesake: Lima, Peru

Founding: 1831 (platting); 1832 (post office)

Population (2020): 35,579

Population (historic): 757 (1850); 4,500 (1870); 15,981 (1890); 30,508 (1910); 42,287 (1930)

Periods of population growth: 1850–1920; 1940s
Pre-1940 residences (estimated): 5,900 (34.7%)
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Outstanding Buildings

1. *Richard Hughes House (c. 1840). North West Street, south of Blue Lick Road. American. Razed.
2. *Isaac Hefner House (1855). 250 South Cool Road. Jackson. Greek Revival.
3. Elijah Helser Farm (c. 1875). 10550 Lafayette Road. Jackson. Italianate.
4. *Lemuel Eversole House (1875). 780 North Napoleon Road. Jackson. Italianate.
5. Solomon Binkley House (c. 1870). 10620 Reservoir Road. Jackson. Italianate.
6. House (c. 1880). 1280 East 5th Street. Marion. Italianate.
7. Farm (c. 1880). 13941 Landeck Road. Marion. Italianate.
8. *Evan Humphreys House (c. 1875). 7201 Leatherwood Road. Marion. Italianate.
9. *School Number Five (1887). 2914 Hillville Road. Monroe. Italianate.
10. *Ross Crossley House (c. 1845). 1240 Greeley Chapel Road. Perry. Razed.
11. Peter Schumacher Farm (1843). 8350 Bixel Road. Richland.
12. Althouse Log House. 7085 Columbus Grove–Bluffton Road. Richland.
13. *Bucher School (1880). 8905 Columbus Grove–Bluffton Road. Richland.
14. Augsburger Farm (c. 1850). 9090 Columbus Grove–Bluffton Road. Richland.
15. Eli Balmer Farm (c. 1845). 9255 Lugabill Road. Richland.
16. David Lugibihl Farm (c. 1840). 11855 Pandora Road. Richland.
17. *William Huber Farm (c. 1880). 5633 North Pevee Road. Richland. Italianate.
18. *Griffith Breese House (1840). 2875 Fort Amanda Road. Shawnee.
19. *Isaac Clevenger House (1869). 7785 Gomer Road. Sugar Creek. Italianate.
20. *Thomas Watkins Farm (1843). 3630 West Lincoln Highway. Sugar Creek.
21. Farm (c. 1890). 6015 Sandy Point Road. Sugar Creek. Italianate/Eastlake.
22. House (c. 1915). 2280 West Lincoln Highway. Sugar Creek. Classical Revival.