- Obstetricians & Gynecologists, Endicott - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Endicott
- Oil & Gas Exploration & Development, Endicott - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Endicott - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Endicott - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Endicott
- Opticians, Endicott
- Optometrists, Endicott - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Endicott - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Endicott
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- Ornamental Nursery, Endicott
- Ornamental Nursery Services, Endicott
- Orthodontist, Endicott - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Endicott
- Other Building Materials & Supplies, Endicott
- Other Lodging, Endicott
- Other Office Supply Stores, Endicott
- Other Specialties, Endicott - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Endicott
- Outdoor Equipment & Accessories, Endicott
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