- Occupational Health Care Professionals, Dekalb
- Occupational Therapy, Dekalb - Occupational Health Specialists
- Office Buildings & Parks, Dekalb
- Office Supplies, Equipment & Office Furniture Stores, Dekalb
- Oil Change & Lubrication, Dekalb - Auto Oil & Quick Lube
- Oncologists, Dekalb - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Dekalb - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Dekalb
- Opticians, Dekalb
- Optometrists, Dekalb - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Dekalb - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Dekalb
- Organizing Services & Products – Household & Business, Dekalb
- Ornamental Greenhouses, Dekalb
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- Ornamental Nursery, Dekalb
- Ornamental Nursery Products, Dekalb
- Ornamental Nursery Services, Dekalb
- Orthodontist, Dekalb - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Dekalb
- Orthopedists, Dekalb - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Dekalb
- Other Attorneys & Lawyers, Dekalb
- Other Building Materials & Supplies, Dekalb
- Other Lawyers & Attorneys, Dekalb
- Outdoor & Lawn & Garden Equipment Repair & Service, Dekalb
- Outdoor Equipment & Accessories, Dekalb
- Overhead Door, Dekalb
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