- Obstetricians & Gynecologists, Bad Axe - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Bad Axe
- Occupational Therapy, Bad Axe - Occupational Health Specialists
- Office Partitions & Dividers, Bad Axe
- Office Supplies, Equipment & Office Furniture Stores, Bad Axe
- Oil Change & Lubrication, Bad Axe - Auto Oil & Quick Lube
- Online Advertising, Bad Axe - Internet Advertising
- Ophthalmologists, Bad Axe - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Bad Axe
- Optometrists, Bad Axe - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Bad Axe - Eye Clinics
- Ornamental Greenhouses, Bad Axe
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- Ornamental Nursery, Bad Axe
- Ornamental Nursery Services, Bad Axe
- Orthodontist, Bad Axe - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Bad Axe - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Bad Axe - Physicians & Surgeons
- Other Building Materials & Supplies, Bad Axe
- Other Lodging, Bad Axe
- Outdoor & Lawn & Garden Equipment Repair & Service, Bad Axe
- Outdoor Equipment & Accessories, Bad Axe
- Outdoor Furniture & Patio Furniture, Bad Axe - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Bad Axe - Oxygen Concentrator, Tank, Machine, etc
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