- Office Equipment & Supplies Manufacturers, Madison Heights
- Office Supplies, Equipment & Office Furniture Stores, Madison Heights
- Offset & Photolithographic Printing, Madison Heights
- Oil & Petroleum Products, Madison Heights - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Madison Heights - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Madison Heights - Oil Companies
- Ophthalmologists, Madison Heights - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Madison Heights
- Opticians, Madison Heights
- Optometrists, Madison Heights - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, Madison Heights
- Oriental Restaurants, Madison Heights
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- Ornamental Nursery, Madison Heights
- Ornamental Nursery Services, Madison Heights
- Orthodontist, Madison Heights - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Madison Heights - Orthopedic Shoes
- Orthopedists, Madison Heights - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Madison Heights - Physicians & Surgeons
- Other Building Materials & Supplies, Madison Heights
- Other Lodging, Madison Heights
- Outdoor & Lawn & Garden Equipment Repair & Service, Madison Heights
- Outdoor Equipment & Accessories, Madison Heights
- Outsourcing Services, Madison Heights
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