| Rank | Abbreviation | Meaning |
|---|
| ***** | OARC | Ohio Area Repeater Council, Inc.
| |
| ***** | OARC | Operations Analysis and Research Center
| |
| ***** | OARC | Ottawa Amateur Radio Club, Inc.
| |
| ***** | OARC | Office of Attorney Regulation Counsel
| |
| **** | OARC | Office of Accounts Receivable and Collections
| |
| **** | OARC | Ontario Agricultural Research Coalition
| |
| **** | OARC | Ogontz Avenue Revitalization Corporation
| |
| **** | OARC | Ordinary Administrative Radio Conference
| |
| **** | OARC | Ontario Association of Residents Councils
| |
| **** | OARC | Oklahoma Association of Regional Councils
| |
| **** | OARC | Oxford Action Resource Centre
| |
| **** | OARC | Ohio Association of Regional Councils
| |
| *** | OARC | Open Access Resource Centre
| |
| *** | OARC | Ohio Adventure Racing Club
| |
| *** | OARC | Offshore Aviation Research Centre
| |
| *** | OARC | Oxford Academicals Rowing Club
| |
| *** | OARC | Ordninary Administrative Radio Conference
| |
| *** | OARC | Older Adult Recovery Center
| |
| ** | OARC | Oakville Amateur Radio Club
| |
| ** | OARC | Ottumwa Amateur Radio Club
| |
| ** | OARC | Orlando Amateur Radio Club
| |
| ** | OARC | Other Acceptable Row Crops
| |
| ** | OARC | oneonta amateur radio club
| |
| ** | OARC | Ogden Amateur Radio Club
| |
| ** | OARC | Owasso Amateur Radio Club
| |