Lake County, Illinois

Founding: 1839
Parent county: McHenry

Namesake: Lake Michigan
Seat: Libertyville (1839–1844); Waukegan (1844–)

Land area: 444 square miles

Population (2020): 714,342

Population (historic): 2,634 (1840); 18,257 (1860); 21,296 (1880); 34,504 (1900); 104,387 (1930)

Periods of population growth: pre-1840–2020

Subdivisions: Seven cities; 45 villages; nine CDPs; 18 townships

Pre-1940 residences (estimated): 22,244 (8.5%)
Pre-1940 housing survival rate: 51.3%
Pre-1860 housing survival rate (1940): 6.5%

Farm housing in disrepair (1950): 5.6%

Nonfarm housing in disrepair (1950): 4.3%

Average farmhouse value (1930): $4,896
Average outbuilding value (1930): $5,212

Average farmhouse size (1940): 6.7 rooms
Number of farms (1920): 2,220
Average farm size (1920): 75.2 acres
Sources of settlement: New York, Germany, Ireland, and Wisconsin
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Waukegan

Namesake: A Potawatomi word meaning "fort" or "fortress"

Founding: 1829 (founding as Little Fort); 1841 (post office); 1852 (incorporation)

Population (2020): 89,321

Population (historic): 3,433 (1860); 4,012 (1880); 9,426 (1900); 33,499 (1930)

Periods of population growth: pre-1860–1870; 1880–2000; 2010s
Pre-1940 residences (estimated): 6,080 (19.2%)
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