Jefferson County, Kentucky (Formed 1780)
                Land Area          
Year  Population  (sq.mi)   Density
2010    741,096     380.4  1,948.1
2000    693,604     385.1  1,801.1
1990    664,937     385.1  1,726.7
1980    685,004     385.1  1,778.8
1970    695,055     385.1  1,804.9
1960    610,947     385.1  1,586.5
1950    484,615     385.1  1,258.4
1940    385,392     385.1  1,000.8
1930    355,350     385.1    922.7
1920    286,369     385.1    743.6
1910    262,920     387.0    679.4
1900    232,549     371.0    626.8
1890    188,598     371.0    508.4
1880    146,010     381.9    382.3
1870    118,953     381.9    311.5
1860     89,404     384.0    232.8
1850     59,831     381.9    156.7
1840     36,346     383.6     94.7
1830     23,979     380.7     63.0
1820     20,768     476.7     43.6
1810     13,399     503.2     26.6
1800      8,754     502.5     17.4
1790      4,765   1,810.8      2.6