| Obedience Dog Training | ABC (A Better Canine) School for Dogs | La Mesa, CA | 619 466-1877 |
| Ocean View Condos | The Grand Baja Resort | Puerto Nuevo, Baja California, MX | 877 315-1002 |
| Oceanfront Condos | The Grand Baja Resort | Puerto Nuevo, Baja California, MX | 877 315-1002 |
| Off-Road | Vee Parts and Accessories | El Cajon, CA | 888 258-5524 |
| Office Equipment | Bomar Business Systems | La Mesa, CA | 619 433-8003 |
| Office Parties | Sage Catering | La Mesa, CA | 619 698-2870 |
| OnLine Diet | Diet Pills Store | Escondido, CA | 800 884-7546 |
| Operated Equipment Rentals | Aztec Rentals | San Diego, CA | 619 582-2245 |
| Optics | El Cajon Gun Exchange | El Cajon, CA | 619 579-5152 |
| Orthopedic Shoes | Z-Coil Footwear | San Diego, CA | 619 291-5938 |