- Obstetricians & Gynecologists, Ypsilanti - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Ypsilanti
- Occupational Therapy, Ypsilanti - Occupational Health Specialists
- Office Buildings & Parks, Ypsilanti
- Office Supplies, Equipment & Office Furniture Stores, Ypsilanti
- Oil & Gas Companies, Ypsilanti
- Oil Change & Lubrication, Ypsilanti - Auto Oil & Quick Lube
- Oncologists, Ypsilanti - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Ypsilanti
- Ophthalmologists, Ypsilanti - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ypsilanti
- Opticians, Ypsilanti
- Optometrists, Ypsilanti - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ypsilanti - Eye Clinics
- Orchestras, Symphonies & Bands, Ypsilanti
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- Ornamental Greenhouses, Ypsilanti
- Ornamental Metal Work, Ypsilanti - Steel, Iron, Bronze, etc
- Ornamental Nursery, Ypsilanti
- Ornamental Nursery Services, Ypsilanti
- Orthopedic & Prosthetic Appliances & Shoes, Ypsilanti - Orthopedic Shoes
- Orthopedists, Ypsilanti - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Ypsilanti
- Outdoor & Lawn & Garden Equipment Repair & Service, Ypsilanti
- Outdoor Advertising & Billboard, Ypsilanti
- Outdoor Equipment & Accessories, Ypsilanti
- Outpatient Services, Ypsilanti - Outpatient Care
- Outsourcing Services, Ypsilanti
- Ownership Organizations, Ypsilanti
- Oxygen & Respiratory Equipment & Supplies, Ypsilanti - Oxygen Concentrator, Tank, Machine, etc
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