Knox County, Kentucky (Formed 1800)
                Land Area          
Year  Population  (sq.mi)   Density
2010     31,883     386.3     82.5
2000     31,795     387.7     82.0
1990     29,676     387.7     76.5
1980     30,239     387.7     78.0
1970     23,689     387.7     61.1
1960     25,258     387.7     65.1
1950     30,409     387.7     78.4
1940     31,029     387.7     80.0
1930     26,266     387.7     67.7
1920     24,172     387.7     62.3
1910     22,116     356.0     62.1
1900     17,372     352.0     49.4
1890     13,762     352.0     39.1
1880     10,587     390.8     27.1
1870      8,294     391.7     21.2
1860      7,707     515.3     15.0
1850      7,050     517.0     13.6
1840      5,722     515.3     11.1
1830      4,315     515.3      8.4
1820      3,661     769.0      4.8
1810      5,875   2,191.7      2.7