Dillon County Population 2018
Dillon County's estimated population is 30,666 with a growth rate of -0.49% in the past year according to the most recent United States census data. Dillon County is the 32nd largest county in South Carolina.
| Year | Population | Growth | Growth Rate |
| 2017 | 30,666 | -151 | -0.49% |
| 2016 | 30,817 | -366 | -1.17% |
| 2015 | 31,183 | -113 | -0.36% |
| 2014 | 31,296 | -109 | -0.35% |
| 2013 | 31,405 | -124 | -0.39% |
| 2012 | 31,529 | -227 | -0.71% |
| 2011 | 31,756 | -325 | -1.01% |
| 2010 | 32,081 | 2,967 | 10.19% |
| 1990 | 29,114 | -1,969 | -6.33% |
| 1980 | 31,083 | 2,245 | 7.78% |
| 1970 | 28,838 | -1,746 | -5.71% |
| 1960 | 30,584 | -346 | -1.12% |
| 1950 | 30,930 | 1,305 | 4.41% |
| 1940 | 29,625 | 3,892 | 15.12% |
| 1930 | 25,733 | 455 | 1.80% |
| 1920 | 25,278 | 2,663 | 11.78% |
| 1910 | 22,615 | 0.00% |