- Obstetricians & Gynecologists, Oakland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Oakland
- Occupational Health Care Physicians & Surgeons, Oakland - Occupational Medicine
- Occupational Health Care Professionals, Oakland
- Occupational Therapy, Oakland - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Oakland
- Office Buildings & Parks, Oakland
- Office Partitions & Dividers, Oakland
- Office Space on Rent, Oakland - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Oakland
- Oil & Gas Companies, Oakland
- Oil & Gas Exploration & Development, Oakland - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Oakland - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Oakland - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Oakland - Oil Companies
- Oil Petroleum Wholesale, Oakland
- Old Age Homes Service, Oakland
- Online Advertising, Oakland - Internet Advertising
- Ophthalmic Goods, Oakland
- Ophthalmic Goods - Manufacturers, Oakland
- Ophthalmologists, Oakland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Oakland - Camera Repair
- Optical Instruments & Lenses Manufacturers, Oakland
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oakland
- Opticians, Oakland
- Optometrists, Oakland - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Oakland - Eye Clinics
- Orchestras, Symphonies & Bands, Oakland
- Organ Donation & Tissue Banks, Oakland
- Organizing Services & Products – Household & Business, Oakland
- Organs Tuning & Repair, Oakland
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- Oriental Goods & Products Stores, Oakland
- Oriental Rugs, Oakland
- Ornamental Iron - Residential, Oakland - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Oakland - Steel, Iron, Bronze, etc
- Ornamental Nursery, Oakland
- Ornamental Nursery Products, Oakland
- Ornamental Nursery Services, Oakland
- Orthodontist, Oakland - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Oakland
- Orthopedic & Prosthetic Appliances & Shoes, Oakland - Orthopedic Shoes
- Orthopedists, Oakland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Oakland
- Osteoporosis Information & Support, Oakland
- Other Attorneys & Lawyers, Oakland
- Other Attorneys & Lawyers, Oakland
- Other Building Materials & Supplies, Oakland
- Other Electrical Products, Oakland
- Other Lawyers & Attorneys, Oakland
- Other Lodging, Oakland
- Other Office Supply Stores, Oakland
- Other Specialties, Oakland - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Oakland
- Outdoor Advertising & Billboard, Oakland
- Outdoor Equipment & Accessories, Oakland
- Outdoor Furniture & Patio Furniture, Oakland - Garden Furniture Stores
- Outdoor Nature & Recycling Program Schools, Oakland
- Outerwear Stores, Oakland - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Oakland - Outpatient Care
- Outsourcing Services, Oakland
- Overhead Door, Oakland
- Ownership Organizations, Oakland
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