- Obstetricians, Portland - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Portland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Portland
- Occupational Therapy, Portland - Occupational Health Specialists
- Oil & Gas Consultants, Portland
- Oil & Gas Exploration & Development, Portland - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Well Drilling Services, Portland
- Oil Change & Lubrication, Portland - Auto Oil & Quick Lube
- Oil Field Contractors, Portland
- Oil Industry & Oil Field Equipment & Services, Portland - Oil Companies
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- Oil Well Logging & Perforating, Portland
- Old Age Homes Service, Portland
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Portland
- Opticians, Portland
- Optometrists, Portland - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Restaurants, Portland
- Orthodontist, Portland - Teeth Straightening, Invisalign & Dental Braces
- Outdoor & Lawn & Garden Equipment Repair & Service, Portland
- Outdoor Furniture & Patio Furniture, Portland - Garden Furniture Stores
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