Rush County Population 2018
Rush County's estimated population is 3,103 with a growth rate of 0.94% in the past year according to the most recent United States census data. Rush County is the 80th largest county in Kansas.
| Year | Population | Growth | Growth Rate |
| 2017 | 3,103 | 29 | 0.94% |
| 2016 | 3,074 | -25 | -0.81% |
| 2015 | 3,099 | -63 | -1.99% |
| 2014 | 3,162 | -16 | -0.50% |
| 2013 | 3,178 | -31 | -0.97% |
| 2012 | 3,209 | -2 | -0.06% |
| 2011 | 3,211 | -103 | -3.11% |
| 2010 | 3,314 | -528 | -13.74% |
| 1990 | 3,842 | -674 | -14.92% |
| 1980 | 4,516 | -601 | -11.75% |
| 1970 | 5,117 | -1,043 | -16.93% |
| 1960 | 6,160 | -1,071 | -14.81% |
| 1950 | 7,231 | -1,054 | -12.72% |
| 1940 | 8,285 | -808 | -8.89% |
| 1930 | 9,093 | 733 | 8.77% |
| 1920 | 8,360 | 534 | 6.82% |
| 1910 | 7,826 | 1,692 | 27.58% |
| 1900 | 6,134 | 930 | 17.87% |
| 1890 | 5,204 | -286 | -5.21% |
| 1880 | 5,490 | 0.00% |