Argonia
- County:
- Sumner County
- County Seat:
- No
- Area (mi²):
- 0.698
- State:
- Kansas
Argonia is a city located in Sumner County, Kansas. Argonia has a 2026 population of 447. Argonia is currently declining at a rate of -0.67% annually and its population has decreased by -1.97% since the most recent census, which recorded a population of 456 in 2020.