- Iconium
- Ida Grove
- Illinois Grove
- Illyria
- Imogene
- Independence
- Indian Ridge Mobile Home Park
- Indiana
- Indianapolis
- Indianola
- Indianola Junction
- Inwood
- Ion
- Ionia
- Iowa Center
- Iowa City
- Iowa Falls
- Iowa Falls Junction
- Ira
- Ireton
- Ironhills
- Irving
- Irvington
- Irwin
- Island 176
- Island 178
- Island 186
- Island 188
- Island 189
- Ivester