Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 18.
ADAMS COUNTY, in the westernmost part of Illinois, bordering the Mississippi river. It is 32 miles in length, with a mean breadth of 24, and contains an area of 768 square miles. The western and most extensive slope declines toward the Mississippi, while that of the east gives rise to the streams running into the Illinois river. Courts are held at Quincy. Pop., in 1830, 3,186; in 1840, 14,476; in 1850, 26,508.