Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 21.
ALEXANDER COUNTY, in the extreme south part of Illinois, situated at the junction of Ohio and Mississippi rivers. Length 23 miles; mean breadth about 17, with an area of 390 square miles. The surface along the borders of the rivers is flat and low, so much so that considerable tracts are annually overflowed. The general character of the soil is fertile, producing excellent crops. Courts are held at Unity. Pop. in 1830, 1,390; in 1840, 3,313; in 1850, 2,484.