Cook County, Illinois

Founding: 1831
Parent county: Putnam

Namesake: Daniel Cook, Illinois politician
Seat: Chicago (1831–)

Land area: 945 square miles

Population (2020): 5,275,541

Population (historic): 10,201 (1840); 144,954 (1860); 607,524 (1880); 1,838,735 (1900); 3,982,123 (1930)

Periods of population growth: pre-1840–1970; 1990s; 2010s

Subdivisions: 23 cities; one town; 111 villages; 29 townships

National Register listings: 539

Pre-1940 residences (estimated): 645,442 (29.3%)
Pre-1940 housing survival rate: 48%
Pre-1860 housing survival rate (1940): 13.4%

Farm housing in disrepair (1950): 4.7%

Nonfarm housing in disrepair (1950): 5.2%

Average farmhouse value (1930): $3,090
Average outbuilding value (1930): $2,939

Average farmhouse size (1940): 6.4 rooms
Number of farms (1920): 5,305
Average farm size (1920): 57.2 acres
Sources of settlement: Germany, Ireland, New York, and England
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Chicago

Namesake: The Chicago River

Founding: 1830 (platting); 1831 (post office); 1837 (incorporation)

Population (2020): 2,746,388

Population (historic): 4,470 (1840); 112,172 (1860); 503,185 (1880); 1,698,575 (1900); 3,376,438 (1930)

Periods of population growth: pre-1840–1930; 1940s; 1990s; 2010s
Pre-1940 residences (estimated): 517,151 (42.1%)
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Outstanding Buildings

1. *Noble–Seymour House (1833/1868). 5624 North Newark Avenue. Jefferson. Italianate.
2. *St. James Catholic Church (1853–1858). 10600 Archer Avenue. Lemont. Gothic Revival.
3. *John Wingert House (1854/1870s). 6231 North Canfield Avenue. Leyden. Italianate.
4. *Robert Vial House (1856). 7425 South Wolf Road. Lyons. Italianate.
5. *The Grove / Robert Kennicott House (c. 1856). 1421 Milwaukee Avenue. Northfield. Gothic Revival.
6. St. John's Lutheran Church (1874). 4247 183rd Street. Rich. Gothic Revival.
7. *St. Peter's Lutheran Church (1863). 202 East Schaumburg Road. Schaumburg. Gothic Revival.
8. *Charles Iglehart House (1857/1870s). 11118 South Artesian Avenue. Worth. Italianate.