Clark County, Illinois

Founding: 1819
Parent county: Crawford

Namesake: George Clark, Virginia military officer
Seat: Darwin (1819–1839); Marshall (1839–)

Land area: 501 square miles

Population (2020): 15,455

Population (historic): 931 (1820); 9,532 (1850); 18,709 (1870); 24,033 (1900); 17,872 (1930)

Periods of population growth: pre-1820–1900; 1930s; 1970s; 1990s

Subdivisions: Three cities; one village; one CDP; 15 townships

National Register listings: 10

Pre-1940 residences (estimated): 1,976 (25.3%)
Pre-1940 housing survival rate: 42.8%
Pre-1860 housing survival rate (1940): 5.2%

Farm housing in disrepair (1950): 7.7%

Nonfarm housing in disrepair (1950): 7.2%

Average farmhouse value (1930): $1,113
Average outbuilding value (1930): $708

Average farmhouse size (1940): 5.4 rooms
Number of farms (1920): 2,801
Average farm size (1920): 86.5 acres
Sources of settlement: Indiana, Ohio, and Kentucky
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Marshall

Namesake: John Marshall, Supreme Court chief justice

Founding: 1835 (platting); 1837 (post office); 1853 (incorporation)

Population (2020): 3,947

Population (historic): 1,885 (1880); 2,077 (1900); 2,368 (1930)

Periods of population growth: pre-1880–1910; 1920–1970; 1980–2020
Pre-1940 residences (estimated): 383 (23.5%)
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Outstanding Buildings

1. *Nineveh Shaw House (1841). National Road, north of Fox Road. Marshall. Razed.