Shelby County, Kentucky (Formed 1792)
                Land Area          
Year  Population  (sq.mi)   Density
2010     42,074     379.6    110.8
2000     33,337     384.2     86.8
1990     24,824     384.2     64.6
1980     23,328     384.2     60.7
1970     18,999     384.2     49.5
1960     18,493     384.2     48.1
1950     17,912     384.2     46.6
1940     17,759     384.2     46.2
1930     17,679     384.2     46.0
1920     18,532     384.2     48.2
1910     18,041     427.0     42.3
1900     18,340     395.0     46.4
1890     16,521     395.0     41.8
1880     16,813     381.5     44.1
1870     15,733     381.5     41.2
1860     16,433     376.8     43.6
1850     17,095     381.5     44.8
1840     17,768     386.0     46.0
1830     19,030     379.2     50.2
1820     21,047     481.1     43.7
1810     14,877     523.7     28.4
1800      8,191     521.7     15.7