Mason County, Illinois

Founding: 1841
Parent counties: Menard and Tazewell

Namesake: George Mason, Virginia politician
Seat: Bath (1844–1851); Havana (1841–1844, 1851–)

Land area: 539 square miles

Population (2020): 13,086

Population (historic): 5,921 (1850); 16,184 (1870); 16,067 (1890); 17,377 (1910); 15,115 (1930)

Periods of population growth: pre-1850–1880; 1890s; 1930s; 1960–1980

Subdivisions: Two cities; one town; six villages; one CDP; 13 townships

National Register listings: Four

Pre-1940 residences (estimated): 2,135 (30.2%)
Pre-1940 housing survival rate: 48.5%
Pre-1860 housing survival rate (1940): 12.5%

Farm housing in disrepair (1950): 7.9%

Nonfarm housing in disrepair (1950): 12.6%

Average farmhouse value (1930): $1,850
Average outbuilding value (1930): $1,821

Average farmhouse size (1940): 5.8 rooms
Number of farms (1920): 1,558
Average farm size (1920): 172.7 acres
Sources of settlement: Germany, Ohio, Pennsylvania, Indiana, and Kentucky
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Havana

Namesake: Havana, Cuba

Founding: 1827 (platting); 1829 (post office); 1848 (incorporation)

Population (2020): 2,963

Population (historic): 462 (1850); 1,785 (1870); 2,525 (1890); 3,525 (1910); 3,451 (1930)

Periods of population growth: pre-1850–1920; 1930–1950; 1960s
Pre-1940 residences (estimated): 557 (38.7%)
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Outstanding Buildings

1. *Benjamin Gatton House (c. 1865). 109 Hickory Street. Bath. Italianate.
2. *Union Church. 22912 North 3400 East. Manito. Gothic Revival.
3. George Randle House (c. 1870). 320 East Roosevelt Road. Mason City. Italianate.