- Occupational Health Care Professionals, Guilford
- Occupational Therapy, Guilford - Occupational Health Specialists
- Oceanographic Services, Guilford
- Office Supplies, Equipment & Office Furniture Stores, Guilford
- Oil Change & Lubrication, Guilford - Auto Oil & Quick Lube
- Ophthalmologists, Guilford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Guilford
- Opticians, Guilford
- Optometrists, Guilford - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Guilford - Eye Clinics
- Oral Surgeon, Guilford - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Guilford
- Ornamental Nursery, Guilford
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- Ornamental Nursery Services, Guilford
- Orthodontist, Guilford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Guilford - Orthopedic Shoes
- Orthopedists, Guilford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Guilford
- Other Lodging, Guilford
- Outboard Motors, Guilford
- Outdoor & Lawn & Garden Equipment Repair & Service, Guilford
- Outdoor Advertising & Billboard, Guilford
- Outdoor Equipment & Accessories, Guilford
- Outpatient Clinics, Guilford - Care & Treatment Centers
- Ownership Organizations, Guilford
- Oxygen & Respiratory Equipment & Supplies, Guilford - Oxygen Concentrator, Tank, Machine, etc
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