Marion County, Missouri

Founding: 1826 (declared in 1822)
Parent county: Ralls

Namesake: Francis Marion, Continental Army officer
Seat: Palmyra (1827–); Hannibal (1901–)

Land area: 437 square miles

Population (2020): 28,525

Population (historic): 4,837 (1830); 12,230 (1850); 23,780 (1870); 26,331 (1900); 33,493 (1930)

Periods of population growth: pre-1830–1910; 1920s; 1970s; 1990–2010

Subdivisions: Three cities; eight townships

National Register listings: 41

Pre-1940 residences (estimated): 3,461 (26.7%)
Pre-1940 housing survival rate: 42.3%
Pre-1860 housing survival rate (1940): 16.3%

Farm housing in disrepair (1950): 8.4%

Nonfarm housing in disrepair (1950): 10.4%

Average farmhouse value (1930): $1,622
Average outbuilding value (1930): $1,296

Average farmhouse size (1940): 5.1 rooms
Number of farms (1920): 1,623
Average farm size (1920): 117.3 acres
Sources of settlement: Kentucky, Illinois, Germany, Virginia, Ohio, and Ireland

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Palmyra

Namesake: The ancient city of Palmyra

Founding: 1819 (platting); 1830 (post office); 1830 (incorporation)

Population (2020): 3,613

Population (historic): 1,265 (1850); 2,615 (1870); 2,515 (1890); 2,168 (1910); 1,967 (1930)

Periods of population growth: pre-1850–1870; 1880s; 1920–1980; 1990–2020
Pre-1940 residences (estimated): 328 (20.2%)
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Hannibal

Namesake: Hannibal Creek 

Founding: 1819 (platting); 1820 (post office); 1839 (incorporation)

Population (2020): 17,312

Population (historic): 2,020 (1850); 10,125 (1870); 12,857 (1890); 18,341 (1910); 22,761 (1930)

Periods of population growth: pre-1850–1890; 1900–1930; 1970s; 2000s
Pre-1940 residences (estimated): 2,676 (33.2%)

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Outstanding Buildings

1. George Todd Farm (c. 1855). 2742 US Highway 61. Fabius. Greek Revival.
2. Logan House (c. 1875). 1600 West Line Street. Liberty. Italianate.
3. *William Walker House (c. 1868). 1425 South Main Street. Liberty. Italianate.
4. *James Culbertson Farm (c. 1854/1908). 7178 Road 402. Liberty. Greek Revival.
5. House (1846). 3749 Road BB. Liberty.
6. Samuel Logan Farm (c. 1860). 5697 Road C. Liberty. Greek Revival.
7. *Ephraim Wilson Farm (c. 1842). 4950 Road 403. Miller. Greek Revival.
8. *Robert Masterson House (c. 1830). 5025 Road 403. Miller. Federal.
9. *Levi Barkley House (c. 1860). 5831 Road 419. Miller. Italianate.
10. *Andalusia / Samuel Hendren Farm (c. 1855). 5591 US Highway 61. Miller. Greek Revival.
11. *Samuel Hendren Log House (c. 1835). 5591 US Highway 61. Miller.