- Office Buildings & Parks, Hanover
- Office Supplies, Equipment & Office Furniture Stores, Hanover
- Oil & Petroleum Products, Hanover - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Hanover - Oil Companies
- Oil Petroleum Wholesale, Hanover
- Ophthalmologists, Hanover - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hanover
- Optometrists, Hanover - Eye Doctors, Physicians & Surgeons (Optometry)
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- Organ Donation & Tissue Banks, Hanover
- Organizing Services & Products – Household & Business, Hanover
- Oriental Restaurants, Hanover
- Ornamental Nursery, Hanover
- Ornamental Nursery Services, Hanover
- Other Building Materials & Supplies, Hanover
- Outdoor Equipment & Accessories, Hanover
- Outerwear Stores, Hanover - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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