| Abbreviation | Definition |
|---|---|
| IOHS | Hamadan, Iran |
| IOHU | Tooyserkan, Iran |
| IOK | Iokea, Papua New Guinea |
| IOM | Isle of Man, England, UK |
| ION | Impfondo, Congo |
| IONV | Tonkabon, Iran |
| IOP | Ioma, Papua New Guinea |
| IOR | Inishmore, Republic Of Ireland |
| IOS | Ilheus, BA, Brazil |
| IOS | Ilheus, Buenos Aires, Brazil |
| IOU | Ile Ouen, New Caledonia |
| IOYQ | Khzer Abad, Iran |
| IPA | Ipota, Vanuatu |
| IPC | Mataveri Airport, Easter Island, Chile |
| IPE | Ipil, Philippines |
| IPG | Ipiranga, Am, Brazil |
| IPH | Ipoh, Malaysia |
| IPI | Ipiales, Colombia |
| IPL | Imperial County Airport, El Centro/ Imperial, California USA |
| IPN | Ipatinga, Minas Gerais, Brazil |