- Occupational Health & Safety, Cary
- Occupational Health Care Professionals, Cary
- Office Buildings & Parks, Cary
- Office Supplies, Equipment & Office Furniture Stores, Cary
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Cary
- Opticians, Cary
- Optometrists, Cary - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Cary
- Ornamental Nursery, Cary
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