Copiah County Population 2018
Copiah County's estimated population is 28,516 with a growth rate of -0.31% in the past year according to the most recent United States census data. Copiah County is the 31st largest county in Mississippi.
| Year | Population | Growth | Growth Rate |
| 2017 | 28,516 | -89 | -0.31% |
| 2016 | 28,605 | -207 | -0.72% |
| 2015 | 28,812 | -116 | -0.40% |
| 2014 | 28,928 | 47 | 0.16% |
| 2013 | 28,881 | -141 | -0.49% |
| 2012 | 29,022 | -262 | -0.89% |
| 2011 | 29,284 | -152 | -0.52% |
| 2010 | 29,436 | 1,844 | 6.68% |
| 1990 | 27,592 | 1,089 | 4.11% |
| 1980 | 26,503 | 1,754 | 7.09% |
| 1970 | 24,749 | -2,302 | -8.51% |
| 1960 | 27,051 | -3,442 | -11.29% |
| 1950 | 30,493 | -3,481 | -10.25% |
| 1940 | 33,974 | 2,360 | 7.47% |
| 1930 | 31,614 | 2,942 | 10.26% |
| 1920 | 28,672 | -7,242 | -20.16% |
| 1910 | 35,914 | 1,519 | 4.42% |
| 1900 | 34,395 | 4,162 | 13.77% |
| 1890 | 30,233 | 2,681 | 9.73% |
| 1880 | 27,552 | 6,944 | 33.70% |
| 1870 | 20,608 | 5,210 | 33.84% |
| 1860 | 15,398 | 3,604 | 30.56% |
| 1850 | 11,794 | 2,840 | 31.72% |
| 1840 | 8,954 | 1,953 | 27.90% |
| 1830 | 7,001 | 0.00% |