- Obstetricians & Gynecologists, Mount Dora - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Mount Dora
- Occupational Therapy, Mount Dora - Occupational Health Specialists
- Office Buildings & Parks, Mount Dora
- Office Supplies, Equipment & Office Furniture Stores, Mount Dora
- Oil & Gas Companies, Mount Dora
- Oil & Gas Hot Shot Services, Mount Dora
- Oil Change & Lubrication, Mount Dora - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Mount Dora - Oil Companies
- Oil Petroleum Wholesale, Mount Dora
- Ophthalmologists, Mount Dora - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mount Dora
- Optometrists, Mount Dora - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Mount Dora - Eye Clinics
- Oral Surgeon, Mount Dora - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Mount Dora
- Ornamental Nursery, Mount Dora
- Ornamental Nursery Products, Mount Dora
- Ornamental Nursery Services, Mount Dora
- Orthodontist, Mount Dora - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Mount Dora - Orthopedic Shoes
- Orthopedists, Mount Dora - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Mount Dora
- Other Lodging, Mount Dora
- Outboard Motors, Mount Dora
- Outdoor & Lawn & Garden Equipment Repair & Service, Mount Dora
- Outdoor Advertising & Billboard, Mount Dora
- Outdoor Equipment & Accessories, Mount Dora
- Oxygen & Respiratory Equipment & Supplies, Mount Dora - Oxygen Concentrator, Tank, Machine, etc
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