- Obstetricians & Gynecologists, Fremont - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Fremont
- Occupational Health Care Professionals, Fremont
- Office Supplies, Equipment & Office Furniture Stores, Fremont
- Oil Change & Lubrication, Fremont - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Fremont - Oil Companies
- Oil Petroleum Wholesale, Fremont
- Ophthalmologists, Fremont - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fremont
- Optometrists, Fremont - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Fremont
- Ornamental Greenhouses, Fremont
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- Ornamental Nursery, Fremont
- Ornamental Nursery Services, Fremont
- Orthodontist, Fremont - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Fremont - Orthopedic Shoes
- Orthopedists, Fremont - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Fremont
- Other Building Materials & Supplies, Fremont
- Other Lodging, Fremont
- Outdoor & Lawn & Garden Equipment Repair & Service, Fremont
- Outdoor Equipment & Accessories, Fremont
- Outpatient Clinics, Fremont - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Fremont - Oxygen Concentrator, Tank, Machine, etc
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