Fayette County Population 2018
Fayette County's estimated population is 21,784 with a growth rate of -0.15% in the past year according to the most recent United States census data. Fayette County is the 54th largest county in Illinois.
| Year | Population | Growth | Growth Rate |
| 2017 | 21,784 | -32 | -0.15% |
| 2016 | 21,816 | -233 | -1.06% |
| 2015 | 22,049 | -14 | -0.06% |
| 2014 | 22,063 | -127 | -0.57% |
| 2013 | 22,190 | 42 | 0.19% |
| 2012 | 22,148 | -223 | -1.00% |
| 2011 | 22,371 | 241 | 1.09% |
| 2010 | 22,130 | 1,237 | 5.92% |
| 1990 | 20,893 | -1,274 | -5.75% |
| 1980 | 22,167 | 1,415 | 6.82% |
| 1970 | 20,752 | -1,194 | -5.44% |
| 1960 | 21,946 | -2,636 | -10.72% |
| 1950 | 24,582 | -4,577 | -15.70% |
| 1940 | 29,159 | 5,672 | 24.15% |
| 1930 | 23,487 | -2,700 | -10.31% |
| 1920 | 26,187 | -1,888 | -6.72% |
| 1910 | 28,075 | 10 | 0.04% |
| 1900 | 28,065 | 4,698 | 20.11% |
| 1890 | 23,367 | 126 | 0.54% |
| 1880 | 23,241 | 3,603 | 18.35% |
| 1870 | 19,638 | 8,449 | 75.51% |
| 1860 | 11,189 | 3,114 | 38.56% |
| 1850 | 8,075 | 1,747 | 27.61% |
| 1840 | 6,328 | 3,624 | 134.02% |
| 1830 | 2,704 | 0.00% |