- Obstetricians & Gynecologists, Mattoon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Mattoon
- Occupational Health Care Physicians & Surgeons, Mattoon - Occupational Medicine
- Occupational Health Care Professionals, Mattoon
- Occupational Medicine Doctors, Mattoon - Physicians & Surgeons
- Off Road Vehicles, Mattoon
- Off Road Vehicles Parts & Accessories, Mattoon
- Office Supplies, Equipment & Office Furniture Stores, Mattoon
- Oil & Gas Companies, Mattoon
- Oil & Petroleum Products, Mattoon - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Mattoon - Auto Oil & Quick Lube
- Oncologists, Mattoon - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Goods Repair & Service, Mattoon - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mattoon
- Opticians, Mattoon
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- Optometrists, Mattoon - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Mattoon - Eye Clinics
- Oral Surgeon, Mattoon - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Mattoon
- Ornamental Nursery, Mattoon
- Ornamental Nursery Products, Mattoon
- Ornamental Nursery Services, Mattoon
- Orthodontist, Mattoon - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Mattoon - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Mattoon
- Other Building Materials & Supplies, Mattoon
- Outdoor & Lawn & Garden Equipment Repair & Service, Mattoon
- Outdoor Equipment & Accessories, Mattoon
- Oxygen & Respiratory Equipment & Supplies, Mattoon - Oxygen Concentrator, Tank, Machine, etc
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