- Office Supplies, Equipment & Office Furniture Stores, South Portland
- Oil & Gas Companies, South Portland
- Oil & Petroleum Products, South Portland - Merchant, Wholesalers, etc
- Oil Brokers, South Portland
- Oil Change & Lubrication, South Portland - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, South Portland - Oil Companies
- Oil Petroleum Wholesale, South Portland
- Oils & Greases, South Portland
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Portland
- Opticians, South Portland
- Optometrists, South Portland - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, South Portland - Dentists - Oral & Maxillofacial Surgeons
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- Orchard Service, South Portland
- Ornamental Greenhouses, South Portland
- Ornamental Nursery, South Portland
- Ornamental Nursery Services, South Portland
- Orthopedists, South Portland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, South Portland
- Other Attorneys & Lawyers, South Portland
- Other Building Materials & Supplies, South Portland
- Other Lawyers & Attorneys, South Portland
- Other Lodging, South Portland
- Outerwear Stores, South Portland - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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