Boyd County, Kentucky (Formed 1860) Land Area Year Population (sq.mi) Density 2010 49,542 159.9 309.9 2000 49,752 160.2 310.6 1990 51,150 160.2 319.3 1980 55,513 160.2 346.5 1970 52,376 160.2 326.9 1960 52,163 160.2 325.6 1950 49,949 160.2 311.8 1940 45,938 160.2 286.8 1930 43,849 160.2 273.7 1920 29,281 160.2 182.8 1910 23,444 159.0 147.4 1900 18,834 175.0 107.6 1890 14,033 175.0 80.2 1880 12,165 165.3 73.6 1870 8,573 165.3 51.9