| ORANGE COUNTY PATHOLOGY MEDICAL GROUP, INC. | — | 1029739 | 1980-11-12 | Active | ORANGE |
| ORANGE COUNTY PEACE OFFICERS ASSOCIATION | — | 0270907 | 1953-02-06 | Active | ORANGE |
| ORANGE COUNTY PEACEBUILDERS, LLC | — | 202252619569 | 2022-09-28 | Active | ORANGE |
| ORANGE COUNTY PEDIATRIC RADIOLOGY ASSOCIATES | — | 3942889 | 2016-09-06 | Active | ORANGE |
| ORANGE COUNTY PEDIATRIC SURGEONS, INC. | — | 1573712 | 1991-04-08 | Suspended | ORANGE |
| ORANGE COUNTY PHYSICAL THERAPY CENTER, INC. | — | 0568486 | 1969-04-28 | Suspended | ORANGE |
| ORANGE COUNTY POOLS AND SPAS, INC. | — | 0701594 | 1973-05-31 | Suspended | ORANGE |
| ORANGE COUNTY POWDER COATING CO., INC. | — | 0641411 | 1971-12-17 | Active | ORANGE |
| ORANGE COUNTY PREMIER | — | 3024920 | 2007-10-01 | Dissolved | ORANGE |
| ORANGE COUNTY PRESS CLUB | — | 4851210 | 2022-02-16 | Active | ORANGE |
| ORANGE COUNTY PRINTING CONSULTANTS, INC. | — | 1742935 | 1994-04-22 | Dissolved | ORANGE |
| ORANGE COUNTY PSYCHIATRIC SERVICES, INC. | — | 3238997 | 2009-12-17 | Dissolved | ORANGE |
| ORANGE COUNTY PSYCHOLOGICAL ASSOCIATION | — | 0582643 | 1969-10-14 | Active | ORANGE |
| ORANGE COUNTY PUBLIC RELATIONS, INC. | — | 0789277 | 1976-12-10 | Suspended | ORANGE |
| ORANGE COUNTY RANGE STORE, LLC | — | 201608410100 | 2016-03-18 | Suspended | ORANGE |
| ORANGE COUNTY REALTY INC. | — | 0378693 | 1959-07-06 | Suspended | ORANGE |
| ORANGE COUNTY REALTY PARTNERS INC. | — | 2964438 | 2007-01-26 | Suspended | ORANGE |
| ORANGE COUNTY REMODELING, INC. | — | 1950866 | 1995-09-28 | Dissolved | ORANGE |
| ORANGE COUNTY RIDING ACADEMY, LLC | — | 201720910399 | 2017-07-24 | Active | ORANGE |
| ORANGE COUNTY ROBOTIC GENERAL SURGERY INC. | — | 4043258 | 2017-07-05 | Active | ORANGE |
| ORANGE COUNTY ROOFING LLC | — | 201103310132 | 2011-01-19 | Suspended | ORANGE |
| ORANGE COUNTY SANDBLASTING, INC. | — | 1967220 | 1996-04-24 | Active | ORANGE |
| ORANGE COUNTY SCAFFOLD, INC. | — | 0607240 | 1970-09-14 | Active | ORANGE |
| ORANGE COUNTY SCUBA CENTER | — | 3575381 | 2013-05-20 | Suspended | ORANGE |
| ORANGE COUNTY SEVEN, LTD. | — | 198420500089 | 1984-07-20 | Active | ORANGE |
| ORANGE COUNTY SOCCER OFFICIALS ASSOCIATION, INC. | — | 1401354 | 1987-03-10 | Dissolved | ORANGE |
| ORANGE COUNTY SPINAL IMAGING, INC. | — | 2551161 | 2003-09-04 | Dissolved | ORANGE |
| ORANGE COUNTY STAND DOWN | — | 3889010 | 2016-03-23 | Suspended | ORANGE |
| ORANGE COUNTY STRENGTH AND CONDITIONING, LLC | — | 201003610179 | 2010-02-03 | Active | ORANGE |
| ORANGE COUNTY STRENGTH CLUB, LLC | — | 201626310426 | 2016-09-13 | Active | ORANGE |
| ORANGE COUNTY STRIPING SERVICE, INC. | — | 0788341 | 1976-11-15 | Dissolved | ORANGE |
| ORANGE COUNTY THORACIC AND CARDIOVASCULAR SURGEONS, A MEDICAL CORPORATION | — | 1915747 | 1994-10-31 | Active | ORANGE |
| ORANGE COUNTY TIRE LLC. | — | 200530010119 | 2005-10-20 | Dissolved | ORANGE |
| ORANGE COUNTY TRADE BINDERY, INC. | — | 0740708 | 1974-11-22 | Dissolved | ORANGE |
| ORANGE COUNTY TRAFFIC ENGINEERING COUNCIL - OCTEC | — | 3119917 | 2009-06-26 | Dissolved | ORANGE |
| ORANGE COUNTY TRAINING MANAGERS ASSOCIATION CORP | — | 4772166 | 2021-07-29 | Active | ORANGE |
| ORANGE COUNTY TRANSIT DISTRICT FINANCING CORPORATION | — | 1516198 | 1990-11-13 | Dissolved | ORANGE |
| ORANGE COUNTY TRANSPORTATION AUTHORITY SCHOLARSHIP FOUNDATION, INC. | Transportation and warehousing | 2062022 | 1997-12-01 | Active | ORANGE |
| ORANGE COUNTY TRAUMA SOCIETY | — | 1335547 | 1985-03-29 | Dissolved | ORANGE |
| ORANGE COUNTY TRAVEL AGENTS ASSOCIATION, INC. | — | 0768927 | 1976-05-03 | Dissolved | ORANGE |
| ORANGE COUNTY VALLEY GOLDMINE LLC | — | 201101210239 | 2010-11-19 | Suspended | ORANGE |
| ORANGE COUNTY VASCULAR ASSOCIATES, INC., A MEDICAL GROUP | — | 2401071 | 2001-11-02 | Dissolved | ORANGE |
| ORANGE COUNTY VOTER INFORMATION PROJECT | — | 3011176 | 2007-08-10 | Active | ORANGE |
| ORANGE COUNTY WALK TO EMMAUS, INC. | — | 1721396 | 1993-03-08 | Suspended | ORANGE |
| ORANGE COUNTY WALK TO REMEMBER, INC. | — | 2896288 | 2006-06-05 | Active | ORANGE |
| ORANGE COUNTY WEB, LLC | — | 199615110005 | 1996-05-30 | Suspended | ORANGE |
| ORANGE COUNTY WHOLESALE ELECTRIC, INC. | — | 0729131 | 1975-01-07 | Merged | ORANGE |
| ORANGE COUNTY WINDOW CLEANING COMPANY, LLC | — | 201528810260 | 2015-10-13 | Dissolved | ORANGE |
| ORANGE COUNTY ZION CHRISTIAN CENTER | — | 1219269 | 1983-12-19 | Active | ORANGE |
| ORANGE CREEK, LLC | — | 201025110224 | 2010-09-01 | Active | ORANGE |