Monroe County, Florida

Founding: 1824 (declared in 1823)
Parent county: St. Johns

Namesake: James Monroe, U.S. president
Seat: Key West (1832–)

Land area: 983 square miles

Population (2020): 82,874

Population (historic): 517 (1830); 2,913 (1860); 10,940 (1880); 18,006 (1900); 13,624 (1930)

Periods of population growth: pre-1830–1890; 1900s; 1930–2000; 2010s

Subdivisions: Four cities; one village; eight CDPs

National Register listings: 58

Pre-1940 residences (estimated): 3,777 (7.1%)
Pre-1940 housing survival rate: 71.3%
Pre-1860 housing survival rate (1940): 9.5%

Housing in disrepair (1950): 7.5%

Average farmhouse value (1930): $1,531
Average outbuilding value (1930): $447
Average farmhouse size (1940): 3.3 rooms
Number of farms (1920): 101
Average farm size (1920): 22.6 acres
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Key West

Namesake: Key West

Founding: 1829 (platting); 1829 (post office); 1829 (incorporation)

Population (2020): 26,444

Population (historic): 688 (1840); 2,832 (1860); 9,890 (1880); 17,114 (1900); 12,831 (1930)

Periods of population growth: pre-1840–1890; 1900s; 1940–1960
Pre-1940 residences (estimated): 3,512 (25.5%)

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