Alexander County, Illinois

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Alexander County is a county located in the U.S. state of Illinois. As of the 2000 census, the population is 9,590. Its county seat is Cairo, Illinois[1]. Alexander County is part of the Cape GirardeauJackson, MO-IL Metropolitan Statistical Area.



Alexander County was organized out of Union County in 1819. It was named for William M. Alexander, who became Speaker of the Illinois House of Representatives in 1822.

Alexander County between 1819 and 1843.

Alexander County reduced to its current borders in 1843 with the creation of Pulaski County.


According to the U.S. Census Bureau, the county has a total area of 253 square miles (660 km2), of which 236 square miles (610 km2) is land and 16 square miles (41 km2) (6.40%) is water. Its borders are partly defined by the Mississippi River and the Ohio River. The lowest point in the state of Illinois is located on the Mississippi River in Cairo in Alexander County, where it flows out of Illinois and into Kentucky.

Adjacent counties

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