Logan County, Illinois

Founding: 1839
Parent county: Sangamon

Namesake: John Logan, Illinois politician
Seat: Postville (1839–1848); Mount Pulaski (1848–1855); Lincoln (1855–)

Land area: 618 square miles

Population (2020): 27,987

Population (historic): 2,634 (1840); 18,257 (1860); 21,296 (1880); 28,680 (1900); 28,863 (1930)

Periods of population growth: pre-1840–1910; 1930–1960; 1990s

Subdivisions: Three cities; eight villages; three CDPs; 17 townships

Pre-1940 residences (estimated): 3,575 (29.6%)
Pre-1940 housing survival rate: 56.2%
Pre-1860 housing survival rate (1940): 11.1%

Farm housing in disrepair (1950): 6.7%

Nonfarm housing in disrepair (1950): 7%

Average farmhouse value (1930): $2,192
Average outbuilding value (1930): $2,417

Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 2,234
Average farm size (1920): 158.9 acres
Sources of settlement: Ohio, Germany, Kentucky, Pennsylvania, Indiana, and Ireland
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Lincoln

Namesake: Abraham Lincoln, U.S. president

Founding: 1853 (platting); 1854 (post office); 1857 (incorporation)

Population (2020): 13,288

Population (historic): 5,639 (1880); 8,962 (1900); 12,855 (1930)

Periods of population growth: pre-1880–1930; 1940–1970
Pre-1940 residences (estimated): 1,638 (25.6%)
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