- Obstetricians & Gynecologists, Plymouth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Plymouth - Occupational Medicine
- Occupational Health Care Professionals, Plymouth
- Occupational Medicine Doctors, Plymouth - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Plymouth
- Oil Change & Lubrication, Plymouth - Auto Oil & Quick Lube
- Optical Goods Manufacturers, Plymouth
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Plymouth
- Opticians, Plymouth
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- Optometrists, Plymouth - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Plymouth
- Ornamental Nursery, Plymouth
- Ornamental Nursery Services, Plymouth
- Orthodontist, Plymouth - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Plymouth
- Other Lodging, Plymouth
- Outdoor Equipment & Accessories, Plymouth
- Outdoor Furniture & Patio Furniture, Plymouth - Garden Furniture Stores
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