- Obstetricians & Gynecologists, Detroit - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Detroit
- Occupational Health Care Physicians & Surgeons, Detroit - Occupational Medicine
- Occupational Health Care Professionals, Detroit
- Occupational Medicine Doctors, Detroit - Physicians & Surgeons
- Office & Meeting Equipment & Supplies Rental, Detroit
- Office Buildings & Parks, Detroit
- Office Furniture & Equipment Rental & Leasing, Detroit
- Office Partitions & Dividers, Detroit
- Office Space on Rent, Detroit - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Detroit
- Offset Printing, Detroit
- Oil & Gas Companies, Detroit
- Oil & Grease Seals, Detroit
- Oil & Petroleum Products, Detroit - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Detroit - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Detroit - Oil Companies
- Oil Petroleum Wholesale, Detroit
- Oils Hydraulic, Detroit
- Oils Industrial, Detroit
- Old Age Homes Service, Detroit
- Online Advertising, Detroit - Internet Advertising
- Open Door Church, Detroit
- Ophthalmologists, Detroit - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Detroit
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Detroit
- Opticians, Detroit
- Optometrists, Detroit - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Detroit - Eye Clinics
- Orchestras, Symphonies & Bands, Detroit
- Organizing Services & Products – Household & Business, Detroit
- Organs Tuning & Repair, Detroit
- Ornamental Metal Work, Detroit - Steel, Iron, Bronze, etc
- Ornamental Nursery, Detroit
- Ornamental Nursery Services, Detroit
- Orthodox Churches, Detroit
- Orthopedic & Prosthetic Appliances & Shoes, Detroit - Orthopedic Shoes
- Orthopedic Shoes, Detroit
- Other Attorneys & Lawyers, Detroit
- Other Attorneys & Lawyers, Detroit
- Other Building Materials & Supplies, Detroit
- Other Electrical Products, Detroit
- Other Industrial Contractors, Detroit
- Other Lawyers & Attorneys, Detroit
- Other Lodging, Detroit
- Other Office Supply Stores, Detroit
- Outdoor & Lawn & Garden Equipment Repair & Service, Detroit
- Outdoor Advertising & Billboard, Detroit
- Outdoor Equipment & Accessories, Detroit
- Outdoor Furniture & Patio Furniture, Detroit - Garden Furniture Stores
- Outerwear & Accessories Manufacturers, Detroit
- Outerwear Stores, Detroit - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Detroit - Care & Treatment Centers
- Outpatient Services, Detroit - Outpatient Care
- Ownership Organizations, Detroit
- Oxygen & Respiratory Equipment & Supplies, Detroit - Oxygen Concentrator, Tank, Machine, etc
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