Rainbow
- County:
- Perkins County
- County Seat:
- No
- Area (mi²):
- 35.416
- State:
- South Dakota
Rainbow is located in Perkins County, South Dakota. Rainbow has a 2025 population of 24 . Rainbow is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 24 in 2020.
The median age in Rainbow is 35.5 years: 31 years for males, and 36.5 years for females. For every 100 females there are 94.7 males.