- Idabel
- Idaho Falls
- Idaho Springs
- Idaville
- Immokalee
- Imperial
- Imperial Beach
- Incline Village
- Independence
- Indialantic
- Indian Creek
- Indian Harbour Beach
- Indian Head Park
- Indian River
- Indian River Shores
- Indian Rocks Beach
- Indian Trail
- Indian Wells
- Indiana
- Indianapolis
- Indianola
- Indiantown
- Indio
- Indooroopilly
- Industry
- Ingalls
- Inglefield
- Ingleside
- Inglewood
- Ingram
- Inkster
- Inman
- Innisfail
- Inver Grove Heights
- Inverness
- Inwood
- Ionia
- Iowa City
- Iowa Falls
- Ipswich
- Ireland
- Irmo
- Iron Mountain
- Irondale
- Irons
- Ironton
- Ironwood
- Iroquois
- Irvine
- Irving
- Irvington
- Irwin
- Irwindale
- Islamorada
- Island Lake
- Islandia
- Isle of Palms
- Isleton
- Islip
- Issaquah
- Italy
- Itasca
- Ithaca
- Iuka
- Ivyland
- Ixonia