Formoso
- County:
- Jewell County
- County Seat:
- No
- Area (mi²):
- 0.247
- State:
- Kansas
Formoso is a city located in Jewell County, Kansas. Formoso has a 2026 population of 91. Formoso is currently declining at a rate of -1.09% annually and its population has decreased by -2.15% since the most recent census, which recorded a population of 93 in 2020.