Hardtner
- County:
- Barber County
- County Seat:
- No
- Area (mi²):
- 0.275
- State:
- Kansas
Hardtner is a city located in Barber County, Kansas. Hardtner has a 2026 population of 163. Hardtner is currently declining at a rate of 0% annually and its population has decreased by -3.55% since the most recent census, which recorded a population of 169 in 2020.