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

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.

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