- Obstetricians & Gynecologists, Okemos - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Okemos
- Occupational Health Care Professionals, Okemos
- Occupational Therapy, Okemos - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Okemos
- Office Furniture & Equipment Rental & Leasing, Okemos
- Office Supplies, Equipment & Office Furniture Stores, Okemos
- Oil & Gas Companies, Okemos
- Oil Change & Lubrication, Okemos - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Okemos
- Opticians, Okemos
- Optometrists, Okemos - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Okemos - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Okemos
- Orthodontist, Okemos - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Okemos - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Okemos - Physicians & Surgeons
- Other Building Materials & Supplies, Okemos
- Outdoor & Lawn & Garden Equipment Repair & Service, Okemos
- Outdoor Advertising & Billboard, Okemos
- Outdoor Equipment & Accessories, Okemos
- Outerwear Stores, Okemos - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outplacement Counseling, Okemos
- Ownership Organizations, Okemos
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