- Office Partitions & Dividers, Northville
- Office Supplies, Equipment & Office Furniture Stores, Northville
- Oil Change & Lubrication, Northville - Auto Oil & Quick Lube
- Ophthalmologists, Northville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Northville
- Optometrists, Northville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Northville - Eye Clinics
- Ornamental Greenhouses, Northville
- Ornamental Nursery, Northville
- Ornamental Nursery Services, Northville
- Orthodontist, Northville - Teeth Straightening, Invisalign & Dental Braces
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- Osteoporosis Doctors, Northville - Physicians & Surgeons
- Other Building Materials & Supplies, Northville
- Other Industrial Contractors, Northville
- Other Lodging, Northville
- Other Office Supply Stores, Northville
- Outdoor & Lawn & Garden Equipment Repair & Service, Northville
- Outdoor Equipment & Accessories, Northville
- Outdoor Furniture, Northville
- Outdoor Furniture & Patio Furniture, Northville - Garden Furniture Stores
- Outpatient Services, Northville - Outpatient Care
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