Martin County, Kentucky (Formed 1870) Land Area Year Population (sq.mi) Density 2010 12,929 229.6 56.3 2000 12,578 230.7 54.5 1990 12,526 230.7 54.3 1980 13,925 230.7 60.4 1970 9,377 230.7 40.6 1960 10,201 230.7 44.2 1950 11,677 230.7 50.6 1940 10,970 230.7 47.6 1930 8,584 230.7 37.2 1920 7,654 230.7 33.2 1910 7,291 227.0 32.1 1900 5,780 224.0 25.8 1890 4,209 224.0 18.8 1880 3,057 231.7 13.2