Williamson County, Illinois

Founding: 1839
Parent county: Franklin

Namesake: Hugh Williamson, North Carolina politician
Seat: Marion (1839–)

Land area: 420 square miles

Population (2020): 67,153

Population (historic): 4,457 (1840); 12,205 (1860); 19,324 (1880); 27,796 (1900); 53,880 (1930)

Periods of population growth: pre-1840–1920; 1960–2020

Subdivisions: Six cities; nine villages; two CDPs

National Register listings: Five

Pre-1940 residences (estimated): 4,203 (13.4%)
Pre-1940 housing survival rate: 40.2%
Pre-1860 housing survival rate (1940): 3.9%

Farm housing in disrepair (1950): 14.5%

Nonfarm housing in disrepair (1950): 8.7%

Average farmhouse value (1930): $815
Average outbuilding value (1930): $499

Average farmhouse size (1940): 4.5 rooms
Number of farms (1920): 2,620
Average farm size (1920): 69.9 acres
Sources of settlement: Tennessee and Kentucky
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Marion

Namesake: Francis Marion, Continental Army general

Founding: 1839 (platting); 1840 (post office); 1841 (incorporation)

Population (2020): 16,855

Population (historic): 881 (1880); 2,510 (1900); 9,033 (1930)

Periods of population growth: pre-1880–1920; 1930–2010
Pre-1940 residences (estimated): 1,302 (15.5%)
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