Hyannis
- County:
- Grant County
- County Seat:
- Yes
- Area (mi²):
- 0.521
- State:
- Nebraska
Hyannis is a village located in Grant County, Nebraska. Hyannis has a 2026 population of 152. It is also the county seat of Grant County. Hyannis is currently growing at a rate of 0.66% annually but its population has decreased by -7.32% since the most recent census, which recorded a population of 164 in 2020.