Adair County, Kentucky (Formed 1802)
                Land Area          
Year  Population  (sq.mi)   Density
2010     18,656     405.3     46.0
2000     17,244     406.8     42.4
1990     15,360     406.9     37.7
1980     15,233     406.9     37.4
1970     13,037     406.9     32.0
1960     14,699     406.9     36.1
1950     17,603     406.9     43.3
1940     18,566     406.9     45.6
1930     16,401     406.9     40.3
1920     17,289     406.9     42.5
1910     16,503     400.0     41.3
1900     14,888     362.0     41.1
1890     13,721     362.0     37.9
1880     13,078     400.5     32.7
1870     11,065     400.5     27.6
1860      9,509     401.1     23.7
1850      9,898     504.3     19.6
1840      8,466     541.7     15.6
1830      8,217     540.5     15.2
1820      8,765     728.8     12.0
1810      6,011     728.8      8.2