Calloway County, Kentucky (Formed 1823) Land Area Year Population (sq.mi) Density 2010 37,191 385.0 96.6 2000 34,177 386.3 88.5 1990 30,735 386.3 79.6 1980 30,031 386.3 77.7 1970 27,692 386.3 71.7 1960 20,972 386.3 54.3 1950 20,147 386.3 52.2 1940 19,041 386.3 49.3 1930 17,662 386.3 45.7 1920 20,802 386.3 53.8 1910 19,867 412.0 48.2 1900 17,633 402.0 43.9 1890 14,675 402.0 36.5 1880 13,295 399.5 33.3 1870 9,410 399.5 23.6 1860 9,915 401.7 24.7 1850 8,096 399.5 20.3 1840 9,794 737.6 13.3 1830 5,164 737.6 7.0