- Obstetricians & Gynecologists, Eureka - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Eureka - Occupational Medicine
- Occupational Health Care Professionals, Eureka
- Occupational Therapy, Eureka - Occupational Health Specialists
- Office Buildings & Parks, Eureka
- Office Supplies, Equipment & Office Furniture Stores, Eureka
- Oil & Gas Additives & Supplies, Eureka
- Oil & Gas Companies, Eureka
- Oil Burners Services, Eureka
- Oil Change & Lubrication, Eureka - Auto Oil & Quick Lube
- Ophthalmologists, Eureka - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Eureka
- Opticians, Eureka
- Optometrists, Eureka - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Restaurants, Eureka
- Ornamental Nursery, Eureka
- Ornamental Nursery Products, Eureka
- Ornamental Nursery Services, Eureka
- Orthopedic & Prosthetic Appliances & Shoes, Eureka - Orthopedic Shoes
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- Orthopedic Appliances, Eureka
- Orthopedic Shoes, Eureka
- Orthopedists, Eureka - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Eureka
- Other Attorneys & Lawyers, Eureka
- Other Building Materials & Supplies, Eureka
- Other Lawyers & Attorneys, Eureka
- Other Lodging, Eureka
- Outboard Motors, Eureka
- Outdoor & Lawn & Garden Equipment Repair & Service, Eureka
- Outdoor Advertising & Billboard, Eureka
- Outdoor Centers, Eureka
- Outdoor Equipment & Accessories, Eureka
- Outdoor Furniture & Patio Furniture, Eureka - Garden Furniture Stores
- Outdoor Power Equipment Repair, Eureka
- Outerwear Stores, Eureka - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Eureka - Outpatient Care
- Overhead Door, Eureka
- Oxygen & Respiratory Equipment & Supplies, Eureka - Oxygen Concentrator, Tank, Machine, etc
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