sort by Rank | Alpha
| Possible Meanings | Rank |
| Onassis Cardiac Surgery Centre | *** |
| Orange County Soccer Club | *** |
| Office of Civil Service Commission | *** |
| Of the Creatures Community | *** |
| Oakland County Sportsman Club | ** |
| Oak Creek Soccer Club | ** |
| Off Camera Shoe Cord | ** |
| Office and Commercial Space Conversion | ** |
| Ossining Community Sailing Club | ** |
| Oregon City Service Center | * |
| Off Campus Study Committee | * |
| Office of Community Safety and Conservation | * |
| Operations Customer Service Committee | * |
| Office of Catholic Schools and Centers | * |
| Officer and Civilian Spouses Club | * |
| Orientation Cum Selection Camps | * |
| Ohio Chapter Sierra Club | * |
| Oklahoma Chapter Sierra Club | * |
| Oregon Chapter Sierra Club | * |
| Ozark Chapter Sierra Club | * |