McDonough County, Illinois

Founding: 1830 (declared in 1826)
Parent county: Unorganized territory

Namesake: Thomas MacDonough, U.S. naval officer
Seat: Macomb (1830–)

Land area: 589 square miles

Population (2020): 27,238

Population (historic): 5,308 (1840); 20,069 (1860); 27,970 (1880); 28,412 (1900); 27,329 (1930)

Periods of population growth: pre-1840–1880; 1890s; 1910–1930; 1940–1980

Subdivisions: Three cities; seven villages; two CDPs; 18 townships

National Register listings: Eight

Pre-1940 residences (estimated): 4,218 (29.2%)
Pre-1940 housing survival rate: 48.5%
Pre-1860 housing survival rate (1940): 8.1%

Farm housing in disrepair (1950): 6.2%

Nonfarm housing in disrepair (1950): 7.5%

Average farmhouse value (1930): $1,977
Average outbuilding value (1930): $1,964

Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 2,728
Average farm size (1920): 106 acres
Sources of settlement: Ohio, Pennsylvania, Kentucky, New York, Indiana, and England
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Macomb

Namesake: Alexander Macomb, U.S. army general

Founding: 1830 (platting as Washington); 1831 (post office); 1841 (incorporation)

Population (2020): 15,051

Population (historic): 756 (1850); 2,748 (1870); 3,140 (1890); 5,774 (1910); 8,509 (1930)

Periods of population growth: pre-1850–1990; 2000s
Pre-1940 residences (estimated): 2,161 (25.8%)
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Outstanding Buildings

1. *Andrew Huff Farm (c. 1870). State Route 9, east of East 450th Road. Blandinsville. Italianate. Razed.
2. *Henry Leighty House (1870). 21680 North 300th Road. Eldorado. Italianate.
3. *Abraham Stickle Farm (1866). 281 Emerson Road. Emmet. Italianate.
4. Matthias Cruser Farm (c. 1875). 405 South Monmouth Street. Sciota. Gothic Revival.
5. *Scotland Township Hall (1907). 14950 North 900th Road. Scotland. Eastlake. Razed.