- Office & Meeting Equipment & Supplies Rental, Duncanville
- Office Furniture & Equipment Repair & Refinish, Duncanville
- Office Supplies, Equipment & Office Furniture Stores, Duncanville
- Oil Change & Lubrication, Duncanville - Auto Oil & Quick Lube
- Ophthalmologists, Duncanville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Duncanville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Duncanville
- Opticians, Duncanville
- Optometrists, Duncanville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Duncanville - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Duncanville
- Ornamental Nursery Services, Duncanville
- Orthodontist, Duncanville - Teeth Straightening, Invisalign & Dental Braces
- Outboard Motors, Duncanville
- Outboard Motors Parts & Repair, Duncanville
- Outdoor & Lawn & Garden Equipment Repair & Service, Duncanville
- Outdoor Equipment & Accessories, Duncanville
- Outplacement Consultants, Duncanville
- Overhead Door, Duncanville
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