Marion County, Kentucky (Formed 1834)
                Land Area          
Year  Population  (sq.mi)   Density
2010     19,820     343.0     57.8
2000     18,212     346.4     52.6
1990     16,499     346.7     47.6
1980     17,910     346.7     51.7
1970     16,714     346.7     48.2
1960     16,887     346.7     48.7
1950     17,212     346.7     49.6
1940     16,913     346.7     48.8
1930     15,499     346.7     44.7
1920     15,527     346.7     44.8
1910     16,330     345.0     47.3
1900     16,290     390.0     41.8
1890     15,648     390.0     40.1
1880     14,693     338.7     43.4
1870     12,838     338.7     37.9
1860     12,593     340.2     37.0
1850     11,765     338.7     34.7
1840     11,032     339.7     32.5