- Office Supplies, Equipment & Office Furniture Stores, Lowell
- Oil & Petroleum Products, Lowell - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Lowell - Auto Oil & Quick Lube
- Ophthalmologists, Lowell - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lowell
- Optometrists, Lowell - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Lowell
- Organizing Services & Products – Household & Business, Lowell
- Ornamental Greenhouses, Lowell
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