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Whiteside County is a county located in the state of Illinois. According to the 2010 census, it had a population of 58,498. Whiteside County was created on January 16, 1836. The county seat is Morrison. The county is named for Samuel Whiteside (1783-1868), state legislator and militia leader.
Whiteside County comprises the Sterling, IL Micropolitan Statistical Area, which is also included in the Dixon-Sterling, IL Combined Statistical Area.
The county is named for Samuel Whiteside, Representative in the first General Assembly and brigadier general in the Black Hawk War.
County QuickFacts: CensusBureau Quick Facts
Whiteside County was created on January 16, 1836 (Laws, 1836, p. 274) and was formed from Jo Daviess and Henry
Counties. County organization was completed in 1839. Present area, or parts of it, formerly included in: Attached to
Ogle [Laws, 1836, p. 277] (1837-1839), Attached to JoDaviess [Laws, 1836, p. 277] (1836-1837), JoDaviess County
(1827-1836), Henry County (1825-1836), Putnam County (1825-1827), Fulton County (1823-1825), Pike County (1821-1823),
Madison County (1812-1821) and St. Clair County (1795-1812).
The County was named for Samuel Whiteside, a Colonel of the Territorial militia, Representative in the First General Assembly, and Brigadier General of the militia during the Black Hawk War. The County Seat is Morrison . Prior County Seats was Lyndon (1839-1841), Sterling (1841-1842), Lyndon (1842-1846), Circuit Court at Sterling, County Commissioners' Court at Lyndon (1846-1847), Sterling (1847-1857), and Morrison (1857-Present).
As reported by the Census Bureau, the county has a total area of 697 square miles (1,805 km2), of which, 685 square miles (1,774 km2) of it is land and 12 square miles (32 km2) of it (1.76%) is water.
Whiteside county is located in north Illinois. The county is
bounded on the west by the Mississippi River. Prophetstown State
Recreation Area and Morrison-Rockwood State Park are located in this
county. Part of Hennepin Canal Parkway State Park and Upper Mississippi
River National Wildlife and Fish Refuge are also located in Whiteside
Bordering counties are as follows: