- Obstetricians & Gynecologists, Ithaca - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Ithaca
- Occupational Therapy, Ithaca - Occupational Health Specialists
- Office Buildings & Parks, Ithaca
- Office Supplies, Equipment & Office Furniture Stores, Ithaca
- Offset & Photolithographic Printing, Ithaca
- Oil Change & Lubrication, Ithaca - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Ithaca - Oil Companies
- Oil Refinery, Ithaca
- Ophthalmologists, Ithaca - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ithaca
- Opticians, Ithaca
- Optometrists, Ithaca - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ithaca - Eye Clinics
- Oral Surgeon, Ithaca - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Ithaca
|
- Orchid Growers, Ithaca
- Ornamental Nursery, Ithaca
- Ornamental Nursery Services, Ithaca
- Orthodontist, Ithaca - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Ithaca
- Orthopedists, Ithaca - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Ithaca
- Other Attorneys & Lawyers, Ithaca
- Other Building Materials & Supplies, Ithaca
- Other Lawyers & Attorneys, Ithaca
- Other Lodging, Ithaca
- Otolaryngologists, Ithaca - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Ithaca
- Outdoor Advertising & Billboard, Ithaca
- Outdoor Equipment & Accessories, Ithaca
- Oxygen & Respiratory Equipment & Supplies, Ithaca - Oxygen Concentrator, Tank, Machine, etc
|