Population Forecast
5 year Forecast - 2%
The current population of the Rapid City, SD Market is 321,793 as of the January 2026 PopStats estimate. PopStat’s Trend models indicate a 5 year population change of 2%, resulting in a Population of 328,303 by January 2031. This percentage change in Population ranks 99th across STI Markets. The Rapid City, SD Market currently ranks 164th in overall population, and will rank 165th by January 2031.
High and Low Range - -1.4% to 10.1%
While the summation of mid range 5 year forecasts foresee a change in Population of 2% for Rapid City, SD Market. The forecast high ranges of these forecasts leaves open the possibility for a Population change as high as 10.1% at 354,180. Similarly a population change as low as -1.4% at 317,295 is not without possibility.
Figure 73: Population Trend and Forecast
10 year Projections - 4.3%
By January 2036 we project the Population of the Rapid City, SD Market to be 335,633 resulting in a change of 4.3% compared to the current Population. This projected percentage change in Population ranks 100th across STI Markets. The Rapid City, SD Market currently ranks 164th in overall population, and will rank 164th by January 2036.
