- Office Space on Rent, Middlefield - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Middlefield
- Oil & Petroleum Products, Middlefield - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Middlefield - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Middlefield
- Opticians, Middlefield
- Optometrists, Middlefield - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Middlefield
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- Ornamental Iron - Residential, Middlefield - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Middlefield - Steel, Iron, Bronze, etc
- Ornamental Nursery, Middlefield
- Ornamental Nursery Services, Middlefield
- Orthopedic Shoes, Middlefield
- Other Building Materials & Supplies, Middlefield
- Outdoor & Lawn & Garden Equipment Repair & Service, Middlefield
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