Union County, Ohio

Founding: 1820
Parent counties: Delaware, Franklin, Logan, and Madison

Namesake: A traditional name
Seats: Milford Center (1820–1822); Marysville (1822–)

Land area: 432 square miles

Population (2020): 62,774

Population (historic): 1,996 (1820); 12,204 (1850); 18,730 (1870); 22,342 (1900); 19,192 (1930)

Periods of population growth: pre-1820–1890; 1930–2020

Subdivisions: Two cities; five villages; two CDPs; 14 townships

National Register listings: Nine

Pre-1940 residences (estimated): 3,257 (16.6%)
Pre-1940 housing survival rate: 66.7%
Pre-1860 housing survival rate (1940): 11.7%

Farm housing in disrepair (1950): 7.3%

Nonfarm housing in disrepair (1950): 6.3%
Average farmhouse value (1930): $1,621
Average outbuilding value (1930): $1,466
Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 2,736
Average farm size (1920): 83 acres
Sources of settlement: Virginia, Pennsylvania, Germany, and Vermont
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Marysville

Namesake: Mary Cuthbertson, daughter of the city's founder

Founding: 1819 (platting); 1824 (post office); 1840 (incorporation)

Population (2020): 25,571

Population (historic): 360 (1840); 849 (1860); 2,061 (1880); 3,048 (1900); 3,639 (1930)

Periods of population growth: pre-1840–1910; 1920–2020
Pre-1940 residences (estimated): 690 (8.4%)

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Outstanding Buildings

1. *The Fort / Shepherd Clark Farm (1877). 26942 North Lewisburg Road. Allen. Italianate.
2. *Nathan Howard Farm (1876). 23190 Middleburg–Plain City Road. Allen. Italianate
3. *Isaac Cahill House (1863). 16417 Miller Road. Claibourne. Italianate. Razed.
4. Richwood Mausoleum (c. 1910). 26763 State Route 37. Claibourne. Classical Revival.
5. *Michael Sager House (c. 1870). 15890 Middleburg–Plain City Road. Darby. Italianate.
6. *James Andrews Farm (1872). 15836 Robinson Road. Darby. Italianate.
7. *Eirick Farm (c. 1870). 12280 State Route 38. Darby. Gothic Revival.
8. *St. John's Lutheran Church (1899–1900). 12809 State Route 736. Darby. Gothic Revival.
9. John Myers House (c. 1875). 17980 White Stone Road. Dover. Italianate.
10. Rush Cheney House (c. 1880). 31737 State Route 37. Jackson. Italianate.
11. Milton Mather House (c. 1895). 33871 State Route 37. Jackson. Queen Anne.
12. *Arthur Kenton House (c. 1840). 12030 Industrial Parkway. Jerome.
13. Hiram Burnham House (c. 1845). 10136 County Line Road. Union. Greek Revival.
14. Hiram Kimball House (c. 1835). 21810 Middleburg–Plain City Road. Union.
15. *Eliphas Bigelow Farm (1846). 20617 State Route 161. Union. Greek Revival.
16. *Elmwood Place / James Fullington Farm (1868). 23855 State Route 161. Union. Italianate.