| Abbreviation | Definition |
|---|---|
| OKK | Kokomo, Indiana USA |
| OKL | Oksibil, Indonesia |
| OKM | Okmulgee Airport, Okmulgee, Oklahoma USA |
| OKN | Okondja, Gabon |
| OKP | Oksapmin, Papua New Guinea |
| OKQ | Okaba, Indonesia |
| OKR | Yorke Islands, Queensland, Australia |
| OKS | Oshkosh, Nebraska USA |
| OKT | Oktiabrskij, Russia |
| OKU | Mokuti Lodge, Namibia |
| OKV | Winchester Regional Airport, Winchester, Virginia USA |
| OKY | Oakey, Queensland, Australia |
| OLA | Orland, Norway |
| OLB | Olbia, Italy |
| OLBA | Beirut International, Lebanon |
| OLD | Old Town, Maine USA |
| OLF | Wolf Point, Montana USA |
| OLH | Old Harbor SeaPlane Base, Old Harbor, Alaska USA |
| OLI | Olafsvik, Iceland |
| OLJ | Olpoi, Vanuatu |