Places beginning with IO in Iowa, United States
- Ioka (historical)
- Iola (historical)
- Ion
- Ionia
- Iowa
- Iowa Center
- Iowa City
- Iowa City
- Iowa County
- Iowa Falls
- Iowa Falls Junction
- Iowa Junction (historical)
- Iowa Lake, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of
- Iowa, Township of