Whiteside County, Illinois

Founding: 1839 (declared in 1836)
Parent counties: Henry and Jo Daviess

Namesake: Samuel Whiteside, Illinois militiaman
Seat: Lyndon (1839–1841); Sterling (1841–1857); Morrison (1857–)

Land area: 684 square miles

Population (2020): 55,691

Population (historic): 2,514 (1840); 18,737 (1860); 30,885 (1880); 34,710 (1900); 39,019 (1930)

Periods of population growth: pre-1840–1880; 1890s; 1910–1980; 1990s

Subdivisions: Five cities; six villages; one CDP; 22 townships

National Register listings: 14

Pre-1940 residences (estimated): 5,998 (23.2%)
Pre-1940 housing survival rate: 58.6%
Pre-1860 housing survival rate (1940): 16.8%

Farm housing in disrepair (1950): 6%

Nonfarm housing in disrepair (1950): 7.5%

Average farmhouse value (1930): $2,185
Average outbuilding value (1930): $2,764

Average farmhouse size (1940): 7.3 rooms
Number of farms (1920): 2,789
Average farm size (1920): 132.5 acres
Sources of settlement: New York, Pennsylvania, Germany, Ireland, and Ohio
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Morrison

Namesake: Charles Morrison, New York merchant

Founding: 1855 (platting); 1857 (post office); 1867 (incorporation)

Population (2020): 4,085

Population (historic): 1,981 (1880); 2,308 (1900); 3,067 (1930)

Periods of population growth: pre-1880–1980; 1990s
Pre-1940 residences (estimated): 636 (34.9%)
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Outstanding Buildings

1. *Samuel Baird Farm (c. 1870). 15509 Habben Road. Hopkins. Italianate.
2. *Stone School (c. 1875). 18985 Freeport Road. Jordan. Italianate.
3. Frank Pfundstein Farm (c. 1895). 20213 Hickory Hills Road. Jordan. Queen Anne.
4. *Whiteside County Infirmary (1870). 18819 Lincoln Road. Mount Pleasant. Italianate. Razed.
5. James Robertson Farm (c. 1860). 14278 Robertson Road. Mount Pleasant. Gothic Revival.
6. *House (c. 1850). 13895 Howard Road. Portland. Greek Revival.
7. *Annan Mill (1858–1859). 13909 Lincoln Road. Union Grove.