Kilborn
- County:
- Grant County
- County Seat:
- No
- Area (mi²):
- 35.793
- State:
- South Dakota
Kilborn is located in Grant County, South Dakota. Kilborn has a 2025 population of 150 . Kilborn is currently declining at a rate of 0% annually and its population has increased by 1.35% since the most recent census, which recorded a population of 148 in 2020.
The median age in Kilborn is 31.7 years: 31.4 years for males, and 32.4 years for females. For every 100 females there are 122.9 males.