- Obstetricians & Gynecologists, Wheat Ridge - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Wheat Ridge
- Off Road Vehicles Parts & Accessories, Wheat Ridge
- Office Supplies, Equipment & Office Furniture Stores, Wheat Ridge
- Oil & Petroleum Products, Wheat Ridge - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Wheat Ridge - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Wheat Ridge
- Oil Industry & Oil Field Equipment & Services, Wheat Ridge - Oil Companies
- Oil Well Equipment & Supplies, Wheat Ridge
- Oncologists, Wheat Ridge - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Wheat Ridge - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Wheat Ridge
- Opticians, Wheat Ridge
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- Optometrists, Wheat Ridge - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Wheat Ridge - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Wheat Ridge
- Ornamental Greenhouses, Wheat Ridge
- Ornamental Nursery, Wheat Ridge
- Ornamental Nursery Services, Wheat Ridge
- Orthopedic & Prosthetic Appliances & Shoes, Wheat Ridge - Orthopedic Shoes
- Orthopedists, Wheat Ridge - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Wheat Ridge
- Other Specialties, Wheat Ridge - Doctors, Physicians & Surgeons
- Outdoor Equipment & Accessories, Wheat Ridge
- Outpatient Services, Wheat Ridge - Outpatient Care
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