|Alexander County Illinois Cities/Towns - America, Cache, Cairo (County Seat), East Cape Giradeau, Elco, Grand Chain, New Grand Chain, Karnak, Olive Branch, Olmstead, Perks, Pulaski, McClure, Miller City, Mounds, Mounds City, Sandusky, Tamms, Thebes, Ullin, Villa Ridge, Wetaug
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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.
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.