- Obstetricians & Gynecologists, Loveland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Loveland - Occupational Medicine
- Occupational Health Care Professionals, Loveland
- Occupational Medicine Doctors, Loveland - Physicians & Surgeons
- Off Road Vehicles, Loveland
- Off Road Vehicles Parts & Accessories, Loveland
- Office Supplies, Equipment & Office Furniture Stores, Loveland
- Oil & Gas Exploration & Development, Loveland - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Loveland - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Loveland - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Loveland - Oil Companies
- Oilfield Trucking, Loveland
- Oncologists, Loveland - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Loveland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Loveland - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Loveland
- Opticians, Loveland
- Optometrists, Loveland - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Loveland - Eye Clinics
- Oral Surgeon, Loveland - Dentists - Oral & Maxillofacial Surgeons
- Oriental Massage, Loveland
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- Ornamental Nursery, Loveland
- Ornamental Nursery Services, Loveland
- Orthodontist, Loveland - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Loveland - Orthopedic Shoes
- Orthopedists, Loveland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteopathic Dizziness & Balance Disorders Doctors, Loveland - Physicians & Surgeons
- Other Attorneys & Lawyers, Loveland
- Other Attorneys & Lawyers, Loveland
- Other Building Materials & Supplies, Loveland
- Other Fuels, Loveland
- Other Industrial Contractors, Loveland
- Other Lawyers & Attorneys, Loveland
- Other Lodging, Loveland
- Outdoor & Lawn & Garden Equipment Repair & Service, Loveland
- Outdoor Centers, Loveland
- Outdoor Equipment & Accessories, Loveland
- Outdoor Furniture, Loveland
- Outdoor Furniture & Patio Furniture, Loveland - Garden Furniture Stores
- Outerwear Stores, Loveland - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Oxygen & Respiratory Equipment & Supplies, Loveland - Oxygen Concentrator, Tank, Machine, etc
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