- Obstetricians, Marathon - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Marathon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Marathon
- Oil Change & Lubrication, Marathon - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Marathon - Oil Companies
- Optical Goods Repair & Service, Marathon - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Marathon
- Optometrists, Marathon - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Marathon
- Ornamental Nursery Services, Marathon
- Orthopedic & Prosthetic Appliances & Shoes, Marathon - Orthopedic Shoes
- Orthopedists, Marathon - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Marathon
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- Other Attorneys & Lawyers, Marathon
- Other Building Materials & Supplies, Marathon
- Other Lawyers & Attorneys, Marathon
- Other Lodging, Marathon
- Otolaryngologists, Marathon - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outboard Motors, Marathon
- Outboard Motors Parts & Repair, Marathon
- Outdoor Equipment & Accessories, Marathon
- Outdoor Furniture, Marathon
- Outdoor Furniture & Patio Furniture, Marathon - Garden Furniture Stores
- Outpatient Services, Marathon - Outpatient Care
- Ownership Organizations, Marathon
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