- Obstetricians & Gynecologists, Rockford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Rockford - Occupational Medicine
- Occupational Health Care Professionals, Rockford
- Occupational Medicine Doctors, Rockford - Physicians & Surgeons
- Occupational Therapy, Rockford - Occupational Health Specialists
- Off Road Vehicles, Rockford
- Off Road Vehicles Parts & Accessories, Rockford
- Office Buildings & Parks, Rockford
- Office Equipment & Supplies Manufacturers, Rockford
- Office Planning & Design, Rockford
- Office Space on Rent, Rockford - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Rockford
- Offset Printing, Rockford
- Oil & Gas Companies, Rockford
- Oil & Petroleum Products, Rockford - Merchant, Wholesalers, etc
- Oil Brokers, Rockford
- Oil Change & Lubrication, Rockford - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Rockford
- Oil Industry & Oil Field Equipment & Services, Rockford - Oil Companies
- Oil Petroleum Wholesale, Rockford
- Oil Refinery, Rockford
- Oils Industrial, Rockford
- Old Age Homes Service, Rockford
- Oncologists, Rockford - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmic Goods, Rockford
- Ophthalmic Instruments & Machinery, Rockford
- Ophthalmologists, Rockford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Rockford - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rockford
- Opticians, Rockford
- Optometrists, Rockford - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Rockford - Eye Clinics
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- Oral Surgeon, Rockford - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Rockford
- Orchestras, Symphonies & Bands, Rockford
- Organizing Services & Products – Household & Business, Rockford
- Oriental Restaurants, Rockford
- Ornamental Greenhouses, Rockford
- Ornamental Iron Work, Rockford
- Ornamental Metal Work, Rockford - Steel, Iron, Bronze, etc
- Ornamental Nursery, Rockford
- Ornamental Nursery Services, Rockford
- Orthodontist, Rockford - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Rockford
- Orthopedic & Prosthetic Appliances & Shoes, Rockford - Orthopedic Shoes
- Orthopedic Appliances, Rockford
- Orthopedists, Rockford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Rockford
- Other Attorneys & Lawyers, Rockford
- Other Attorneys & Lawyers, Rockford
- Other Building Materials & Supplies, Rockford
- Other Electrical Products, Rockford
- Other Lawyers & Attorneys, Rockford
- Other Lodging, Rockford
- Other Office Supply Stores, Rockford
- Other Specialties, Rockford - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Rockford
- Outdoor Equipment & Accessories, Rockford
- Outdoor Furniture & Patio Furniture, Rockford - Garden Furniture Stores
- Outerwear Stores, Rockford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Rockford - Care & Treatment Centers
- Outpatient Services, Rockford - Outpatient Care
- Outsourcing Services, Rockford
- Oxygen & Respiratory Equipment & Supplies, Rockford - Oxygen Concentrator, Tank, Machine, etc
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