- Obstetricians & Gynecologists, Shelby Township - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Shelby Township
- Occupational Health Care Professionals, Shelby Township
- Office Supplies, Equipment & Office Furniture Stores, Shelby Township
- Oil & Petroleum Products, Shelby Township - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Shelby Township - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Shelby Township - Oil Companies
- Oils Industrial, Shelby Township
- Old Age Homes Service, Shelby Township
- Ophthalmologists, Shelby Township - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Shelby Township
- Opticians, Shelby Township
- Optometrists, Shelby Township - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Shelby Township - Eye Clinics
- Oriental Restaurants, Shelby Township
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- Ornamental Greenhouses, Shelby Township
- Ornamental Nursery, Shelby Township
- Ornamental Nursery Services, Shelby Township
- Orthodontist, Shelby Township - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Shelby Township - Orthopedic Shoes
- Osteoporosis Doctors, Shelby Township - Physicians & Surgeons
- Other Attorneys & Lawyers, Shelby Township
- Other Attorneys & Lawyers, Shelby Township
- Other Building Materials & Supplies, Shelby Township
- Other Lawyers & Attorneys, Shelby Township
- Other Lodging, Shelby Township
- Outdoor & Lawn & Garden Equipment Repair & Service, Shelby Township
- Outdoor Equipment & Accessories, Shelby Township
- Outdoor Furniture & Patio Furniture, Shelby Township - Garden Furniture Stores
- Outpatient Services, Shelby Township - Outpatient Care
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