- Iron Islands
- Irona
- Irondale
- Irondale
- Ironsides
- Ironsides Island
- Ironton
- Ironville
- Iroquois
- Irvine Mills
- Irving
- Ischua
- Ishua Valley Estates Mobile Home Park
- Island Cottage Beach
- Island House
- Island Number Nine
- Island of Meadows
- Isle of Pines
- Isle of Pines Mobile Home Park
- Isle of San Souci
- Isle of the Cayugas
- Isle of the Mohawks
- Isle of the Oneidas
- Isle of the Onondagas
- Isle of the Senecas
- Isman Mobile Home Park
- Italy
- Italy Hill
- Itaska
- Ivanhoe