Monroe County, Illinois

Founding: 1816
Parent counties: Randolph and St. Clair

Namesake: James Monroe, U.S. president
Seat: Harrisonville (1816–1825); Waterloo (1825–)

Land area: 385 square miles

Population (2020): 34,962

Population (historic): 1,537 (1820); 7,679 (1850); 12,982 (1870); 13,847 (1900); 12,369 (1930)

Periods of population growth: pre-1820–1880; 1890s; 1930–2020

Subdivisions: Two cities; four villages

Pre-1940 residences (estimated): 1,770 (12.6%)
Pre-1940 housing survival rate: 55.6%
Pre-1860 housing survival rate (1940): 12.5%

Farm housing in disrepair (1950): 7.2%

Nonfarm housing in disrepair (1950): 5.4%

Average farmhouse value (1930): $1,291
Average outbuilding value (1930): $1,242

Average farmhouse size (1940): 5.2 rooms
Number of farms (1920): 1,498
Average farm size (1920): 109.5 acres
Sources of settlement: Germany and Missouri

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Waterloo

Namesake: The Battle of Waterloo

Founding: 1818 (platting); 1818 (post office); 1849 (incorporation)

Population (2020): 11,013

Population (historic): 791 (1850); 1,537 (1870); 1,860 (1890); 2,091 (1910); 2,239 (1930)

Periods of population growth: pre-1850–1900; 1920–2020
Pre-1940 residences (estimated): 450 (10.3%)

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