- Office Supplies, Equipment & Office Furniture Stores, Swansea
- Oil Burners Services, Swansea
- Oil Change & Lubrication, Swansea - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Swansea
- Opticians, Swansea
- Optometrists, Swansea - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Swansea - Dentists - Oral & Maxillofacial Surgeons
- Orchid Growers, Swansea
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- Ornamental Greenhouses, Swansea
- Ornamental Nursery, Swansea
- Ornamental Nursery Services, Swansea
- Other Building Materials & Supplies, Swansea
- Outdoor Equipment & Accessories, Swansea
- Outdoor Furniture & Patio Furniture, Swansea - Garden Furniture Stores
- Outerwear Stores, Swansea - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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