| Abbreviation | Definition |
|---|---|
| OBD | Obano, Indonesia |
| OBF | Oberpfaffenhofen, Germany |
| OBI | Obidos, Pa, Brazil |
| OBK | Northbrook, Illinois USA |
| OBM | Morobe, Papua New Guinea |
| OBN | Connel, Oban, Scotland |
| OBO | Obihiro, Japan |
| OBS | Aubenas, France |
| OBU | Kobuk, Alaska USA |
| OBX | Obo, Papua New Guinea |
| OBY | Scoresbysund, Greenland |
| OCA | Ocean Reef Club, Florida USA |
| OCE | Ocean City, Maryland USA |
| OCF | Ocala International Airport - Jim Taylor Field, Ocala, Florida USA |
| OCH | Nacogdoches, Texas USA |
| OCI | Oceanic, Alaska USA |
| OCJ | Ocho Rios, Jamaica |
| OCN | Oceanside, California USA |
| OCQ | Oconto Municipal Airport, Oshkosh, Wisconsin USA |
| OCV | Ocana, Colombia |