- Oceanographic Services, Shrewsbury
- Office Supplies, Equipment & Office Furniture Stores, Shrewsbury
- Oil Change & Lubrication, Shrewsbury - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Shrewsbury - Oil Companies
- Oils & Greases, Shrewsbury
- Opticians, Shrewsbury
- Optometrists, Shrewsbury - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Shrewsbury
- Ornamental Greenhouses, Shrewsbury
- Ornamental Nursery, Shrewsbury
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- Ornamental Nursery Services, Shrewsbury
- Orthodontist, Shrewsbury - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Shrewsbury
- Orthopedic & Prosthetic Appliances & Shoes, Shrewsbury - Orthopedic Shoes
- Orthotics and Prosthetics, Shrewsbury
- Other Building Materials & Supplies, Shrewsbury
- Outdoor & Lawn & Garden Equipment Repair & Service, Shrewsbury
- Outdoor Advertising & Billboard, Shrewsbury
- Outdoor Equipment & Accessories, Shrewsbury
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