- Obstetricians, Jamestown - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Jamestown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Jamestown
- Occupational Health Care Professionals, Jamestown
- Occupational Therapy, Jamestown - Occupational Health Specialists
- Office Equipment & Supplies Manufacturers, Jamestown
- Office Supplies, Equipment & Office Furniture Stores, Jamestown
- Office Systems Designer & Consultants, Jamestown
- Oil Change & Lubrication, Jamestown - Auto Oil & Quick Lube
- Oilfield Trucking, Jamestown
- Oils Recycling, Jamestown
- Oncologists, Jamestown - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Jamestown - Internet Advertising
- Ophthalmologists, Jamestown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Jamestown
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Jamestown
- Opticians, Jamestown
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- Optometrists, Jamestown - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Jamestown
- Oriental Restaurants, Jamestown
- Ornamental Greenhouses, Jamestown
- Ornamental Nursery, Jamestown
- Ornamental Nursery Services, Jamestown
- Orthodontist, Jamestown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Jamestown - Orthopedic Shoes
- Orthotics and Prosthetics, Jamestown
- Other Building Materials & Supplies, Jamestown
- Outdoor Advertising & Billboard, Jamestown
- Outdoor Equipment & Accessories, Jamestown
- Outdoor Furniture & Patio Furniture, Jamestown - Garden Furniture Stores
- Outpatient Clinics, Jamestown - Care & Treatment Centers
- Overhead Door, Jamestown
- Oxygen & Respiratory Equipment & Supplies, Jamestown - Oxygen Concentrator, Tank, Machine, etc
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