- Obstetricians & Gynecologists, Costa Mesa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office & Meeting Equipment & Supplies Rental, Costa Mesa
- Office Buildings & Parks, Costa Mesa
- Office Furniture & Equipment Rental & Leasing, Costa Mesa
- Office Furniture & Equipment Repair & Refinish, Costa Mesa
- Office Partitions & Dividers, Costa Mesa
- Office Planning & Design, Costa Mesa
- Office Space on Rent, Costa Mesa - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Costa Mesa
- Oil & Gas Companies, Costa Mesa
- Oil & Gas Producers, Costa Mesa - Companies
- Oil & Petroleum Products, Costa Mesa - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Costa Mesa - Auto Oil & Quick Lube
- Online Advertising, Costa Mesa - Internet Advertising
- Ophthalmic Goods, Costa Mesa
- Ophthalmic Instruments & Machinery, Costa Mesa
- Ophthalmologists, Costa Mesa - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Costa Mesa
- Optical Instruments & Lenses Manufacturers, Costa Mesa
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Costa Mesa
- Opticians, Costa Mesa
- Optometrists, Costa Mesa - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Costa Mesa - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Costa Mesa
- Oriental Rugs, Costa Mesa
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- Ornamental Iron - Residential, Costa Mesa - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Iron Work, Costa Mesa
- Ornamental Metal Work, Costa Mesa - Steel, Iron, Bronze, etc
- Ornamental Nursery, Costa Mesa
- Ornamental Nursery Services, Costa Mesa
- Orthodontist, Costa Mesa - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Costa Mesa
- Orthopedic & Prosthetic Appliances & Shoes, Costa Mesa - Orthopedic Shoes
- Orthopedists, Costa Mesa - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Costa Mesa
- Osteoporosis Doctors, Costa Mesa - Physicians & Surgeons
- Other Attorneys & Lawyers, Costa Mesa
- Other Attorneys & Lawyers, Costa Mesa
- Other Building Materials & Supplies, Costa Mesa
- Other Lawyers & Attorneys, Costa Mesa
- Other Lodging, Costa Mesa
- Outboard Motors Parts & Repair, Costa Mesa
- Outdoor & Lawn & Garden Equipment Repair & Service, Costa Mesa
- Outdoor Advertising & Billboard, Costa Mesa
- Outdoor Equipment & Accessories, Costa Mesa
- Outdoor Furniture, Costa Mesa
- Outdoor Furniture & Patio Furniture, Costa Mesa - Garden Furniture Stores
- Outerwear Stores, Costa Mesa - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Costa Mesa - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Costa Mesa - Oxygen Concentrator, Tank, Machine, etc
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