Knox County, Ohio

Founding: 1808
Parent counties: Fairfield and Franklin

Namesake: Henry Knox, Continental Amy general
Seat: Mount Vernon (1808–)

Land area: 525 square miles

Population (2020): 62,721

Population (historic): 2,149 (1810); 29,579 (1840); 26,333 (1870); 27,768 (1900); 29,338 (1930)

Periods of population growth: pre-1810–1840; 1870–1910; 1930–2020

Subdivisions: One city; eight villages; two CDPs; 22 townships

National Register listings: 45

Pre-1940 residences (estimated): 6,375 (25.2%)
Pre-1940 housing survival rate: 68.2%
Pre-1860 housing survival rate (1940): 18.9%

Farm housing in disrepair (1950): 5.9%

Nonfarm housing in disrepair (1950): 4.4%
Average farmhouse value (1930): $1,438
Average outbuilding value (1930): $1,283
Average farmhouse size (1940): 7.2 rooms
Number of farms (1920): 3,108
Average farm size (1920): 83 acres
Sources of settlement: Pennsylvania, Maryland, Virginia, New York, New Jersey, and England
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Mount Vernon

Namesake: Mount Vernon, George Washington's plantation

Founding: 1805 (platting); 1809 (post office)

Population (2020): 16,956

Population (historic): 314 (1810); 3,711 (1850); 5,249 (1880); 6,638 (1900); 9,370 (1930)

Periods of population growth: 1805–2010
Pre-1940 residences (estimated): 2,078 (27.7%)
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Outstanding Buildings

1. James McIntire House (c. 1855). 19531 Ankneytown Road. Berlin. Razed.
2. Berlin Methodist Church (c. 1890). 17900 Knox Lake Road. Berlin. Eastlake.
3. John Gardner Farm (c. 1875). 24033 Danville–Amity Road. Brown. Italianate.
4. Farm (c. 1875). 17769 Wooster Road. Brown. Italianate. Razed.
5. Joseph Hammell Farm (c. 1875). 6771 Esto Road. Butler. Italianate.
6. *John Schnebley House (1838). 20992 Sycamore Road. Clay. Federal.
7. John Harrod House (1836). 23160 Sycamore Road. Clay.
8. John Gotshall Farm (c. 1870/1910). 8850 Granville Road. Clinton. Italianate/Classical Revival.
9. William Wing House (1899). 9217 Granville Road. Clinton. Shingle.
10. Welsh House (c. 1875). 12440 New Delaware Road. Clinton. Italianate.
11. *James McFarland House (1823). 7864 Newark Road. Clinton. Greek Revival.
12. *Christ Church at the Quarry (1863). 10930 Quarry Chapel Road. College. Gothic Revival.
13. *William Lepley House (1832). 25657 Newcastle Road. Harrison. Federal.
14. Thomas Head House (c. 1830). 21495 Zion Road. Harrison.
15. Stephen Workman Log House (c. 1830). 13681 Humbert Road. Howard. Dismantled.
16. *Knox County Infirmary (1874–1877). 7516 Johnstown Road. Liberty. Gothic Revival/Italianate. Razed.
17. Sampson Zent House (c. 1845). 17387 Waterford Road. Middlebury. Greek Revival. Razed.
18. *Enoch Thompson House (c. 1855). 2168 Granville Road. Miller. Gothic Revival. Razed.
19. Jacob Bell House (c. 1850). 18024 Arrington Road. Morgan. Greek Revival. Razed.
20. Jackson Letts House (c. 1870). 4780 DeVore Road. Morgan. Italianate.
21. Albert Sperry House (c. 1860). 4573 Newark Road. Morgan. Greek Revival/Gothic Revival.
22. Christian Knox House (1831). 16660 Old Mansfield Road. Morris.
23. William Smith House (c. 1870). 7534 Jacobs Road. Pleasant. Italianate.
24. Jacob Forry Farm (c. 1875). 17459 Sycamore Road. Pleasant. Italianate.
25. *Bell House (1836). 18010 Sycamore Road. Pleasant. Federal.
26. Samuel Rood House (c. 1875). 9709 Sparta Road. Wayne. Italianate.