Leslie County, Kentucky (Formed 1878) Land Area Year Population (sq.mi) Density 2010 11,310 400.8 28.2 2000 12,401 404.0 30.7 1990 13,642 404.0 33.8 1980 14,882 404.0 36.8 1970 11,623 404.0 28.8 1960 10,941 404.0 27.1 1950 15,537 404.0 38.5 1940 14,981 404.0 37.1 1930 10,765 404.0 26.6 1920 10,097 404.0 25.0 1910 8,976 373.0 24.1 1900 6,753 397.0 17.0 1890 3,964 397.0 10.0 1880 3,740 403.3 9.3