- Obstetricians & Gynecologists, Fallbrook - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Fallbrook - Occupational Medicine
- Occupational Health Care Professionals, Fallbrook
- Office Supplies, Equipment & Office Furniture Stores, Fallbrook
- Oil & Gas Companies, Fallbrook
- Oil & Petroleum Products, Fallbrook - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Fallbrook - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Fallbrook - Oil Companies
- Ophthalmic Goods, Fallbrook
- Ophthalmic Instruments & Machinery, Fallbrook
- Optical Goods Manufacturers, Fallbrook
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fallbrook
- Optometrists, Fallbrook - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Fallbrook - Dentists - Oral & Maxillofacial Surgeons
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- Orchard Service, Fallbrook
- Orchid Growers, Fallbrook
- Ornamental Iron - Residential, Fallbrook - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Iron Work, Fallbrook
- Ornamental Metal Work, Fallbrook - Steel, Iron, Bronze, etc
- Ornamental Nursery, Fallbrook
- Ornamental Nursery Products, Fallbrook
- Ornamental Nursery Services, Fallbrook
- Orthodontist, Fallbrook - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Fallbrook
- Other Lodging, Fallbrook
- Other Office Supply Stores, Fallbrook
- Outdoor Equipment & Accessories, Fallbrook
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