Ithaca
- County:
- Gratiot County
- County Seat:
- Yes
- Area (mi²):
- 5.724
- State:
- Michigan
Ithaca is a city located in Gratiot County, Michigan. Ithaca has a 2026 population of 2,813. It is also the county seat of Gratiot County. Ithaca is currently declining at a rate of -0.18% annually and its population has decreased by -1.26% since the most recent census, which recorded a population of 2,849 in 2020.