- Obstetricians & Gynecologists, Fitchburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Fitchburg
- Off Road Vehicles Parts & Accessories, Fitchburg
- Office Buildings & Parks, Fitchburg
- Office Supplies, Equipment & Office Furniture Stores, Fitchburg
- Oil Change & Lubrication, Fitchburg - Auto Oil & Quick Lube
- Old Age Homes Service, Fitchburg
- Optical Goods Repair & Service, Fitchburg - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fitchburg
- Opticians, Fitchburg
- Optometrists, Fitchburg - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchard Service, Fitchburg
- Organ Donation & Tissue Banks, Fitchburg
- Ornamental Greenhouses, Fitchburg
- Ornamental Nursery, Fitchburg
- Ornamental Nursery Services, Fitchburg
- Orthodontist, Fitchburg - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Fitchburg
- Other Building Materials & Supplies, Fitchburg
- Outdoor Equipment & Accessories, Fitchburg
- Outdoor Furniture, Fitchburg
- Outdoor Furniture & Patio Furniture, Fitchburg - Garden Furniture Stores
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