- Obstetricians & Gynecologists, Lake Havasu City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Lake Havasu City
- Occupational Rehabilitation, Lake Havasu City
- Off Road Vehicles, Lake Havasu City
- Off Road Vehicles Parts & Accessories, Lake Havasu City
- Office Supplies, Equipment & Office Furniture Stores, Lake Havasu City
- Oil & Gas Exploration & Development, Lake Havasu City - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Lake Havasu City - Companies
- Oil Change & Lubrication, Lake Havasu City - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Lake Havasu City - Oil Companies
- Ophthalmologists, Lake Havasu City - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Lake Havasu City - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lake Havasu City
- Opticians, Lake Havasu City
- Optometrists, Lake Havasu City - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Lake Havasu City - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Iron Work, Lake Havasu City
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- Ornamental Nursery, Lake Havasu City
- Ornamental Nursery Services, Lake Havasu City
- Orthodontist, Lake Havasu City - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Lake Havasu City - Orthopedic Shoes
- Orthopedists, Lake Havasu City - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Lake Havasu City
- Other Building Materials & Supplies, Lake Havasu City
- Other Office Supply Stores, Lake Havasu City
- Outboard Motors, Lake Havasu City
- Outdoor & Lawn & Garden Equipment Repair & Service, Lake Havasu City
- Outdoor Equipment & Accessories, Lake Havasu City
- Outdoor Furniture, Lake Havasu City
- Outdoor Furniture & Patio Furniture, Lake Havasu City - Garden Furniture Stores
- Overhead Door, Lake Havasu City
- Ownership Organizations, Lake Havasu City
- Oxygen & Respiratory Equipment & Supplies, Lake Havasu City - Oxygen Concentrator, Tank, Machine, etc
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