- Obstetricians & Gynecologists, Brentwood - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Brentwood
- Occupational Health Care Physicians & Surgeons, Brentwood - Occupational Medicine
- Occupational Health Care Professionals, Brentwood
- Occupational Therapy, Brentwood - Occupational Health Specialists
- Office Buildings & Parks, Brentwood
- Office Supplies, Equipment & Office Furniture Stores, Brentwood
- Oil & Petroleum Products, Brentwood - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Brentwood - Auto Oil & Quick Lube
- Ophthalmic Goods, Brentwood
- Ophthalmologists, Brentwood - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Brentwood
- Opticians, Brentwood
- Optometrists, Brentwood - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Brentwood - Eye Clinics
- Oral Surgeon, Brentwood - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Brentwood
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- Organic Farms, Brentwood
- Ornamental Iron - Residential, Brentwood - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Brentwood - Steel, Iron, Bronze, etc
- Ornamental Nursery, Brentwood
- Ornamental Nursery Services, Brentwood
- Orthodontist, Brentwood - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Brentwood - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Brentwood
- Other Specialties, Brentwood - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Brentwood
- Outdoor Advertising & Billboard, Brentwood
- Outdoor Equipment & Accessories, Brentwood
- Outerwear & Accessories Manufacturers, Brentwood
- Outpatient Services, Brentwood - Outpatient Care
- Overhead Door, Brentwood
- Oxygen & Respiratory Equipment & Supplies, Brentwood - Oxygen Concentrator, Tank, Machine, etc
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