- Obstetricians & Gynecologists, Walnut Creek - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Walnut Creek
- Occupational Health Care Physicians & Surgeons, Walnut Creek - Occupational Medicine
- Occupational Health Care Professionals, Walnut Creek
- Occupational Therapy, Walnut Creek - Occupational Health Specialists
- Off Road Vehicles, Walnut Creek
- Off Road Vehicles Parts & Accessories, Walnut Creek
- Office & Meeting Equipment & Supplies Rental, Walnut Creek
- Office Buildings & Parks, Walnut Creek
- Office Supplies, Equipment & Office Furniture Stores, Walnut Creek
- Oil & Gas Companies, Walnut Creek
- Oil & Gas Producers, Walnut Creek - Companies
- Oil & Petroleum Products, Walnut Creek - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Walnut Creek - Auto Oil & Quick Lube
- Old Age Homes Service, Walnut Creek
- Oncologists, Walnut Creek - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Walnut Creek
- Ophthalmologists, Walnut Creek - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Walnut Creek - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Walnut Creek
- Opticians, Walnut Creek
- Optometrists, Walnut Creek - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Walnut Creek - Eye Clinics
- Oral Surgeon, Walnut Creek - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Walnut Creek
- Oriental Goods & Products Stores, Walnut Creek
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- Oriental Rugs, Walnut Creek
- Ornamental Iron - Residential, Walnut Creek - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Walnut Creek - Steel, Iron, Bronze, etc
- Ornamental Nursery, Walnut Creek
- Ornamental Nursery Services, Walnut Creek
- Orthopedic & Prosthetic Appliances & Shoes, Walnut Creek - Orthopedic Shoes
- Orthopedists, Walnut Creek - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Walnut Creek - Physicians & Surgeons
- Other Attorneys & Lawyers, Walnut Creek
- Other Attorneys & Lawyers, Walnut Creek
- Other Building Materials & Supplies, Walnut Creek
- Other Lawyers & Attorneys, Walnut Creek
- Other Lodging, Walnut Creek
- Other Specialties, Walnut Creek - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Walnut Creek
- Outdoor Equipment & Accessories, Walnut Creek
- Outdoor Furniture, Walnut Creek
- Outdoor Furniture & Patio Furniture, Walnut Creek - Garden Furniture Stores
- Outdoor Nature & Recycling Program Schools, Walnut Creek
- Outpatient Services, Walnut Creek - Outpatient Care
- Outplacement Consultants, Walnut Creek
- Outplacement Counseling, Walnut Creek
- Overhead Door, Walnut Creek
- Ownership Organizations, Walnut Creek
- Oxygen & Respiratory Equipment & Supplies, Walnut Creek - Oxygen Concentrator, Tank, Machine, etc
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