Sanborn County Population 2018
Sanborn County's estimated population is 2,450 with a growth rate of 3.03% in the past year according to the most recent United States census data. Sanborn County is the 53rd largest county in South Dakota.
| Year | Population | Growth | Growth Rate |
| 2017 | 2,450 | 72 | 3.03% |
| 2016 | 2,378 | 33 | 1.41% |
| 2015 | 2,345 | 15 | 0.64% |
| 2014 | 2,330 | 4 | 0.17% |
| 2013 | 2,326 | 8 | 0.35% |
| 2012 | 2,318 | -37 | -1.57% |
| 2011 | 2,355 | 1 | 0.04% |
| 2010 | 2,354 | -479 | -16.91% |
| 1990 | 2,833 | -380 | -11.83% |
| 1980 | 3,213 | -484 | -13.09% |
| 1970 | 3,697 | -944 | -20.34% |
| 1960 | 4,641 | -501 | -9.74% |
| 1950 | 5,142 | -612 | -10.64% |
| 1940 | 5,754 | -1,572 | -21.46% |
| 1930 | 7,326 | -551 | -7.00% |
| 1920 | 7,877 | 1,270 | 19.22% |
| 1910 | 6,607 | 2,143 | 48.01% |
| 1900 | 4,464 | -146 | -3.17% |
| 1890 | 4,610 | 0.00% |