Lyon
- County:
- Decatur County
- County Seat:
- No
- Area (mi²):
- 35.913
- State:
- Kansas
Lyon is located in Decatur County, Kansas. Lyon has a 2025 population of 13 . Lyon 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 13 in 2020.