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Pike County was formed on January 31, 1821 and its current county boundaries which total 828 square miles were established by 1825. Pike County is named for Pike County, Kentucky which in turn was named for Zebulon Montgomery Pike (1779-1813), a general of the War of 1812, an explorer of the Louisiana Purchase and the discoverer of Pikes Peak in Colorado.

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Pike County IL Formation
1778 - Virginia State - Illinois County
1784 - Northwest Territory
1801 - Indiana Territory - St. Clair County
1809 - Illinois Territory - St. Clair County
1812 - Illinois Territory - Madison County
1821 - Illinois State - Pike County (consisted of all portions of state North and West of the Illinois River)
1825 - Illinois State - Pike County - current boundaries

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