- Obstetricians & Gynecologists, Altus - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Altus
- Occupational Therapy, Altus - Occupational Health Specialists
- Off Road Vehicles, Altus
- Off Road Vehicles Parts & Accessories, Altus
- Office Supplies, Equipment & Office Furniture Stores, Altus
- Oil Change & Lubrication, Altus - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Altus - Oil Companies
- Oncologists, Altus - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Altus - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Altus
- Optometrists, Altus - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Restaurants, Altus
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- Ornamental Nursery, Altus
- Ornamental Nursery Products, Altus
- Ornamental Nursery Services, Altus
- Orthodontist, Altus - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Altus - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Altus
- Other Lodging, Altus
- Outdoor & Lawn & Garden Equipment Repair & Service, Altus
- Outdoor Equipment & Accessories, Altus
- Outpatient Clinics, Altus - Care & Treatment Centers
- Overhead Door, Altus
- Oxygen & Respiratory Equipment & Supplies, Altus - Oxygen Concentrator, Tank, Machine, etc
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