- Idaho Falls
- Ijamsville
- Imlay City
- Immokalee
- Imperial
- Incline Village
- Independence
- Indialantic
- Indian Head
- Indian River Shores
- Indian Trail
- Indian Wells
- Indiana
- Indianapolis
- Indio
- Ingleside
- Inglewood
- Inman
- Intercourse
- Intervale
- Inver Grove Heights
- Inverness
- Inwood
- Ione
- Ionia
- Iowa
- Iowa City
- Iowa Falls
- Ipswich
- Irmo
- Iron Mountain
- Irondale
- Ironsides
- Irvine
- Irving
- Irvington
- Irwin
- Irwindale
- Island Park
- Islandia
- Isle of Palms
- Islip Terrace
- Issaquah
- Issue
- Italy
- Itasca
- Ithaca
- Ivyland