- Obstetricians & Gynecologists, East Lansing - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, East Lansing
- Occupational Therapy, East Lansing - Occupational Health Specialists
- Office Buildings & Parks, East Lansing
- Office Supplies, Equipment & Office Furniture Stores, East Lansing
- Oil & Gas Exploration & Development, East Lansing - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, East Lansing - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, East Lansing - Oil Companies
- Oncologists, East Lansing - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, East Lansing - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, East Lansing
- Opticians, East Lansing
- Optometrists, East Lansing - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, East Lansing - Dentists - Oral & Maxillofacial Surgeons
- Organ Donation & Tissue Banks, East Lansing
- Oriental Goods & Products Stores, East Lansing
- Ornamental Nursery, East Lansing
- Ornamental Nursery Products, East Lansing
- Orthodontist, East Lansing - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, East Lansing
- Orthopedic & Prosthetic Appliances & Shoes, East Lansing - Orthopedic Shoes
- Orthopedists, East Lansing - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, East Lansing - Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, East Lansing
- Outdoor Advertising & Billboard, East Lansing
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