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

National Register listings: 13

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
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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%)
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Outstanding Buildings

1. *Orson Rogers Farm (c. 1847). 19621 East Grant Highway. Coral. Greek Revival.
2. Emmett Wilcox Farm (c. 1875). 9703 Harmony Hill Road. Coral. Second Empire.
3. Christopher Walkup House (1869). 2809 Country Club Road. Dorr. Italianate.
4. Tracy Russell House (c. 1875). 21003 McGuire Road. Dunham. Italianate.
5. Augustus Morgan Farm (c. 1860). 9316 State Route 173. Hebron. Greek Revival. Razed.
6. Charles Tryon Farm (1866). 8914 Tryon Grove Road. Hebron. Italianate.
7. John Stewart Farm (c. 1850). 11201 Vanderkarr Road. Hebron. Greek Revival.
8. Alexander Hanly House (c. 1870). 4520 Crystal Lake Road. McHenry. Italianate. Razed.
9. *Page Colby House (c. 1850). 4112 McCullom Lake Road. McHenry. Greek Revival.
10. *George Stickney Farm (1860). 1904 Cherry Valley Road. Nunda. Italianate.
11. *Samuel Terwilliger Farm (1849). 7920 Mason Hill Road. Nunda. Greek Revival.
12. *Gustavus Palmer House (1858). 5516 Terra Cotta Road. Nunda. Greek Revival.
13. John Walkup House (1856). 5215 Walkup Road. Nunda. Greek Revival.