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

National Register listings: 100

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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Outstanding Buildings

1. *Henry Paddock House (c. 1865). 346 Sheridan Road. Benton. Italianate.
2. *John Strang House (1880). 19020 Old Grass Lake Road. Lake Villa. Italianate.
3. *John Strang House (1856). 18750 Millburn Road. Newport. Greek Revival/Italianate.
4. *St. Sava Serbian Orthodox Church (1925). 32377 Milwaukee Road. Warren. Byzantine Revival.
5. *John Haines House (c. 1870). 1917 Sheridan Road. Waukegan. Italianate.
6. Louis Swift House (c. 1875). 16 East Westleigh Road. West Deerfield. Italianate.
7. St. Patrick Catholic Church (1910). 991 Waukegan Road. West Deerfield. Romanesque.