Washington County, Illinois

Founding: 1818
Parent county: St. Clair

Namesake: George Washington, U.S. president
Seat: Covington (1818–1831); Nashville (1831–)

Land area: 563 square miles

Population (2020): 13,761

Population (historic): 1,517 (1820); 6,953 (1850); 17,599 (1870); 19,526 (1900); 16,286 (1930)

Periods of population growth: pre-1820–1880; 1890s; 1960–1980; 1990s

Subdivisions: Three cities; ten villages; 16 townships

Pre-1940 residences (estimated): 1,544 (23.3%)
Pre-1940 housing survival rate: 40%
Pre-1860 housing survival rate (1940): 7.7%

Farm housing in disrepair (1950): 13.4%

Nonfarm housing in disrepair (1950): 10.4%

Average farmhouse value (1930): $1,147
Average outbuilding value (1930): $930

Average farmhouse size (1940): 5.2 rooms
Number of farms (1920): 2,357
Average farm size (1920): 113.8 acres
Sources of settlement: Germany, Missouri, Tennessee, and Kentucky
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Nashville

Namesake: Nashville, Tennessee

Founding: 1830 (platting as New Nashville); 1831 (post office); 1853 (incorporation)

Population (2020): 3,105

Population (historic): 872 (1860); 2,222 (1880); 2,184 (1900); 2,243 (1930)

Periods of population growth: pre-1860–1880; 1890s; 1910–1990; 2000s
Pre-1940 residences (estimated): 288 (21.8%)
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Outstanding Buildings

1. St. John's Lutheran Church (1863). 18049 State Route 127. Hoyleton. Gothic Revival.
2. John Hood House (1843). 1602 County Road 16. Oakdale.
3. Olive Branch Lutheran Church (c. 1890). 11265 State Route 177. Okawville. Gothic Revival.
4. St. John's Evangelical Church (c. 1895). 9971 Plum Hill Church Road. Plum Hill. Romanesque.

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