- Obstetricians & Gynecologists, Huntersville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Huntersville
- Off Road Vehicles Parts & Accessories, Huntersville
- Office Supplies, Equipment & Office Furniture Stores, Huntersville
- Oil & Petroleum Retail, Huntersville
- Oil Change & Lubrication, Huntersville - Auto Oil & Quick Lube
- Oncologists, Huntersville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntersville
- Optometrists, Huntersville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Huntersville
- Ornamental Nursery, Huntersville
- Ornamental Nursery Services, Huntersville
- Orthodontist, Huntersville - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic Appliances, Huntersville
- Orthopedic Shoes, Huntersville
- Orthopedists, Huntersville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Huntersville
- Other Building Materials & Supplies, Huntersville
- Other Lodging, Huntersville
- Otolaryngologists, Huntersville - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Huntersville
- Outplacement Consultants, Huntersville
- Outplacement Counseling, Huntersville
- Outplacement Services, Huntersville
- Ownership Organizations, Huntersville
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