- Office Supplies, Equipment & Office Furniture Stores, Vacaville
- Oil & Petroleum Products, Vacaville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Vacaville - Auto Oil & Quick Lube
- Old Age Homes Service, Vacaville
- Oncologists, Vacaville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Vacaville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Instruments & Lenses Manufacturers, Vacaville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vacaville
- Opticians, Vacaville
- Optometrists, Vacaville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Vacaville - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Vacaville
- Ornamental Iron - Residential, Vacaville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Vacaville - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Vacaville
- Ornamental Nursery Products, Vacaville
- Ornamental Nursery Services, Vacaville
- Orthodontist, Vacaville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Vacaville - Orthopedic Shoes
- Other Building Materials & Supplies, Vacaville
- Other Industrial Contractors, Vacaville
- Other Office Supply Stores, Vacaville
- Outdoor & Lawn & Garden Equipment Repair & Service, Vacaville
- Outdoor Centers, Vacaville
- Outdoor Equipment & Accessories, Vacaville
- Outerwear Stores, Vacaville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Vacaville - Outpatient Care
- Overhead Door, Vacaville
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