McHenry County, Illinois

Founding: 1837 (declared in 1836)
Parent county: Cook

Namesake: William McHenry, Illinois politician
Seat: McHenry (1836–1843); Woodstock (1843–)

Land area: 603 square miles

Population (2020): 310,229

Population (historic): 2,578 (1840); 22,089 (1860); 24,908 (1880); 29,759 (1900); 35,079 (1930)

Periods of population growth: pre-1840–2020

Subdivisions: Five cities; two CDPs; 17 townships

Pre-1940 residences (estimated): 9,246 (7.8%)
Pre-1940 housing survival rate: 82.7%
Pre-1860 housing survival rate (1940): 12.5%

Farm housing in disrepair (1950): 4.5%

Nonfarm housing in disrepair (1950): 2%

Average farmhouse value (1930): $2,483
Average outbuilding value (1930): $3,560

Average farmhouse size (1940): 7.6 rooms
Number of farms (1920): 2,874
Average farm size (1920): 92 acres
Sources of settlement: New York, Germany, Ireland, Wisconsin, and Vermont
_________________________________________________________________________________

Woodstock

Namesake: Woodstock, Vermont

Founding: 1843 (platting as Centerville); 1843 (post office); 1852 (incorporation)

Population (2020): 25,630

Population (historic): 1,327 (1860); 1,475 (1880); 2,502 (1900); 5,471 (1930)

Periods of population growth: pre-1860–1870; 1880–1920; 1930–2020
Pre-1940 residences (estimated): 1,734 (17.1%)
_________________________________________________________________________________

View and filter the data. Or see a map.
_________________________________________________________________________________