Nyssa
- County:
- Malheur County
- County Seat:
- No
- Area (mi²):
- 1.55
- State:
- Oregon
Nyssa is a city located in Malheur County, Oregon. Nyssa has a 2026 population of 3,269. Nyssa is currently growing at a rate of 0.09% annually and its population has increased by 1.81% since the most recent census, which recorded a population of 3,211 in 2020.