Obion County, Tennessee

Founding: 1823
Parent county: Unorganized territory

Namesake: The Obion River
Seat: Troy (1824–1890); Union City (1890–)

Land area: 545 square miles

Population (2020): 30,787

Population (historic): 2,099 (1830); 12,817 (1860); 22,912 (1880); 28,286 (1900); 29,086 (1930)

Periods of population growth: pre-1830–1910; 1920–1940; 1960–1980; 1990s

Subdivisions: Three cities; seven towns

National Register listings: 20

Pre-1940 residences (estimated): 1,475 (10%)
Pre-1940 housing survival rate: 18.5%
Pre-1860 housing survival rate (1940): 3.9%

Farm housing in disrepair (1950): 19.8%

Nonfarm housing in disrepair (1950): 19.9%

Average farmhouse value (1930): $762
Average outbuilding value (1930): $475
Average farmhouse size (1940): 4.4 rooms
Number of farms (1920): 3,378
Average farm size (1920): 66.5 acres
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Troy (ex-seat)

Namesake: The legendary city of Troy

Founding: 1824 (post office); 1825 (platting); 1901 (incorporation)

Population (2020): 1,423

Population (historic): 177 (1850); 500 (1870); 394 (1890); 529 (1910); 522 (1930)

Periods of population growth: pre-1850–1870; 1880–1910; 1920s; 1940s; 1960–1980; 1990–2020
Pre-1940 residences (estimated): 57 (8%)
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Union City

Namesake: The city's placement at a railroad junction

Founding: 1854 (platting); 1856 (incorporation)

Population (2020): 11,170

Population (historic): 1,879 (1880); 3,407 (1900); 5,865 (1930)

Periods of population growth: pre-1880–1890; 1900–1970; 1980–2020
Pre-1940 residences (estimated): 554 (10.7%)
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Outstanding Buildings

1. House (c. 1860). 485 Campground Road. Italianate.