- Obstetricians & Gynecologists, Sanford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Sanford - Occupational Medicine
- Occupational Health Care Professionals, Sanford
- Off Road Vehicles, Sanford
- Off Road Vehicles Parts & Accessories, Sanford
- Office Supplies, Equipment & Office Furniture Stores, Sanford
- Oil & Gas Companies, Sanford
- Oil & Petroleum Retail, Sanford
- Oil Change & Lubrication, Sanford - Auto Oil & Quick Lube
- Oncologists, Sanford - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Sanford - Internet Advertising
- Ophthalmologists, Sanford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sanford
- Opticians, Sanford
- Optometrists, Sanford - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Sanford - Eye Clinics
- Oral Surgeon, Sanford - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Sanford
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- Ornamental Nursery, Sanford
- Ornamental Nursery Services, Sanford
- Orthodontist, Sanford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Sanford - Orthopedic Shoes
- Orthopedists, Sanford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Sanford
- Other Building Materials & Supplies, Sanford
- Other Lodging, Sanford
- Outdoor & Lawn & Garden Equipment Repair & Service, Sanford
- Outdoor Advertising & Billboard, Sanford
- Outdoor Equipment & Accessories, Sanford
- Outdoor Furniture & Patio Furniture, Sanford - Garden Furniture Stores
- Outdoor Furniture Manufacturers, Sanford
- Outpatient Clinics, Sanford - Care & Treatment Centers
- Outpatient Services, Sanford - Outpatient Care
- Overhead Door, Sanford
- Ownership Organizations, Sanford
- Oxygen & Respiratory Equipment & Supplies, Sanford - Oxygen Concentrator, Tank, Machine, etc
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