Keystone
- County:
- Scott County
- County Seat:
- No
- Area (mi²):
- 79.654
- State:
- Kansas
Keystone is located in Scott County, Kansas. Keystone has a 2025 population of 87 . Keystone is currently declining at a rate of -1.14% annually and its population has decreased by -5.43% since the most recent census, which recorded a population of 92 in 2020.
The median age in Keystone is 51.7 years: 0 years for males, and 0 years for females. For every 100 females there are 75.0 males.