Mercer County, Missouri

Founding: 1845 (declared in 1843)
Parent county: Unorganized territory

Namesake: John Mercer, Virginia politician
Seat: Princeton (1846–)

Land area: 454 square miles

Population (2020): 3,538

Population (historic): 2,691 (1850); 11,557 (1870); 14,581 (1890); 12,335 (1910); 9,350 (1930)

Periods of population growth: pre-1850–1880; 1890s; 1990–2010

Subdivisions: Two cities; one village; one CDP; nine townships

National Register listings: Two

Pre-1940 residences (estimated): 457 (21.4%)
Pre-1940 housing survival rate: 20.7%
Pre-1860 housing survival rate (1940): 2.6%

Farm housing in disrepair (1950): 17.5%

Nonfarm housing in disrepair (1950): 26.6%

Average farmhouse value (1930): $999
Average outbuilding value (1930): $737

Average farmhouse size (1940): 4.9 rooms
Number of farms (1920): 1,959
Average farm size (1920): 118.3 acres
Sources of settlement: Missouri, Indiana, Ohio, Iowa, Illinois, Kentucky, and Tennessee

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Princeton

Namesake: Princeton, New Jersey

Founding: 1846 (platting); 1846 (post office); 1891 (incorporation)

Population (2020): 1,007

Population (historic): 249 (1860); 1,240 (1880); 1,575 (1900); 1,509 (1930)

Periods of population growth: pre-1860–1900; 1910s; 1930s; 1990–2010
Pre-1940 residences (estimated): 144 (25.1%)

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