- Obstetricians & Gynecologists, Bowie - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Bowie
- Office Supplies, Equipment & Office Furniture Stores, Bowie
- Oil Change & Lubrication, Bowie - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Bowie - Oil Companies
- Oil Refinery, Bowie
- Old Age Homes Service, Bowie
- Ophthalmologists, Bowie - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Bowie
- Opticians, Bowie
- Optometrists, Bowie - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Bowie - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Bowie
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- Oriental Goods & Products Stores, Bowie
- Ornamental Nursery, Bowie
- Ornamental Nursery Services, Bowie
- Orthodontist, Bowie - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Bowie - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Bowie
- Outdoor & Lawn & Garden Equipment Repair & Service, Bowie
- Outdoor Equipment & Accessories, Bowie
- Outdoor Furniture & Patio Furniture, Bowie - Garden Furniture Stores
- Outdoor Furniture Manufacturers, Bowie
- Outsourcing Services, Bowie
- Ownership Organizations, Bowie
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