- Obstetricians, Gainesville - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Gainesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Gainesville - Occupational Medicine
- Occupational Health Care Professionals, Gainesville
- Occupational Medicine Doctors, Gainesville - Physicians & Surgeons
- Occupational Therapy, Gainesville - Occupational Health Specialists
- Off Road Vehicles, Gainesville
- Off Road Vehicles Parts & Accessories, Gainesville
- Office Buildings & Parks, Gainesville
- Office Equipment & Supplies Manufacturers, Gainesville
- Office Furniture & Equipment Repair & Refinish, Gainesville
- Office Space on Rent, Gainesville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Gainesville
- Oil & Gas Exploration & Development, Gainesville - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Gainesville - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Gainesville
- Oil Change & Lubrication, Gainesville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Gainesville - Oil Companies
- Oil Petroleum Wholesale, Gainesville
- Oils Industrial, Gainesville
- Old Age Homes Service, Gainesville
- Oncologists, Gainesville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Gainesville
- Ophthalmologists, Gainesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Gainesville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Gainesville
- Opticians, Gainesville
- Optometrists, Gainesville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Gainesville - Eye Clinics
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- Oral Surgeon, Gainesville - Dentists - Oral & Maxillofacial Surgeons
- Organ Donation & Tissue Banks, Gainesville
- Oriental Goods & Products Stores, Gainesville
- Ornamental Metal Work, Gainesville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Gainesville
- Ornamental Nursery Services, Gainesville
- Orthodontist, Gainesville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Gainesville
- Orthopedic & Prosthetic Appliances & Shoes, Gainesville - Orthopedic Shoes
- Orthopedists, Gainesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Gainesville
- Other Attorneys & Lawyers, Gainesville
- Other Building Materials & Supplies, Gainesville
- Other Industrial Contractors, Gainesville
- Other Lawyers & Attorneys, Gainesville
- Other Lodging, Gainesville
- Other Specialties, Gainesville - Doctors, Physicians & Surgeons
- Otolaryngologists, Gainesville - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outboard Motors Parts & Repair, Gainesville
- Outdoor & Lawn & Garden Equipment Repair & Service, Gainesville
- Outdoor Equipment & Accessories, Gainesville
- Outdoor Furniture, Gainesville
- Outdoor Furniture & Patio Furniture, Gainesville - Garden Furniture Stores
- Outerwear & Accessories Manufacturers, Gainesville
- Outerwear Stores, Gainesville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Gainesville - Outpatient Care
- Overhead Door, Gainesville
- Ownership Organizations, Gainesville
- Oxygen & Respiratory Equipment & Supplies, Gainesville - Oxygen Concentrator, Tank, Machine, etc
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