- Obstetricians & Gynecologists, Douglasville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Douglasville - Occupational Medicine
- Occupational Health Care Professionals, Douglasville
- Occupational Therapy, Douglasville - Occupational Health Specialists
- Office Buildings & Parks, Douglasville
- Office Supplies, Equipment & Office Furniture Stores, Douglasville
- Oil Change & Lubrication, Douglasville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Douglasville - Oil Companies
- Oncologists, Douglasville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Douglasville - Internet Advertising
- Ophthalmologists, Douglasville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Douglasville
- Opticians, Douglasville
- Optometrists, Douglasville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Douglasville - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Douglasville
- Ornamental Nursery Products, Douglasville
- Ornamental Nursery Services, Douglasville
- Orthodontist, Douglasville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Douglasville - Orthopedic Shoes
- Orthopedists, Douglasville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Douglasville
- Other Lodging, Douglasville
- Otolaryngologists, Douglasville - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Douglasville
- Outdoor Equipment & Accessories, Douglasville
- Outerwear & Accessories Manufacturers, Douglasville
- Outerwear Stores, Douglasville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Ownership Organizations, Douglasville
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