Marshall County, Kentucky (Formed 1842)
                Land Area          
Year  Population  (sq.mi)   Density
2010     31,448     301.3    104.4
2000     30,125     304.9     98.8
1990     27,205     304.9     89.2
1980     25,637     304.9     84.1
1970     20,381     304.9     66.8
1960     16,736     304.9     54.9
1950     13,387     304.9     43.9
1940     16,602     304.9     54.5
1930     12,889     304.9     42.3
1920     15,215     304.9     49.9
1910     15,771     327.0     48.2
1900     13,692     332.0     41.2
1890     11,287     332.0     34.0
1880      9,647     339.7     28.4
1870      9,455     339.7     27.8
1860      6,982     339.6     20.6
1850      5,269     339.7     15.5