- Office Buildings & Parks, Leominster
- Office Furniture & Equipment Repair & Refinish, Leominster
- Office Supplies, Equipment & Office Furniture Stores, Leominster
- Oil & Gas Companies, Leominster
- Oil & Gas Exploration & Development, Leominster - Oil Field Exploration, Monitoring & Remediation
- Oil Burners Services, Leominster
- Oil Change & Lubrication, Leominster - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Leominster - Oil Companies
- Ophthalmologists, Leominster - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Leominster
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Leominster
- Opticians, Leominster
- Optometrists, Leominster - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchard Service, Leominster
- Orchestras, Symphonies & Bands, Leominster
- Ornamental Greenhouses, Leominster
- Ornamental Nursery, Leominster
- Ornamental Nursery Services, Leominster
- Orthodontist, Leominster - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Leominster - Orthopedic Shoes
- Other Building Materials & Supplies, Leominster
- Outdoor & Lawn & Garden Equipment Repair & Service, Leominster
- Outdoor Equipment & Accessories, Leominster
- Outerwear Stores, Leominster - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outsourcing Services, Leominster
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