- Obstetricians & Gynecologists, Falmouth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Falmouth
- Occupational Therapy, Falmouth - Occupational Health Specialists
- Oceanographic Research & Development, Falmouth
- Oceanographic Services, Falmouth
- Office Supplies, Equipment & Office Furniture Stores, Falmouth
- Oil Change & Lubrication, Falmouth - Auto Oil & Quick Lube
- Ophthalmologists, Falmouth - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Falmouth
- Opticians, Falmouth
- Optometrists, Falmouth - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Falmouth - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Falmouth
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- Ornamental Nursery, Falmouth
- Ornamental Nursery Services, Falmouth
- Orthopedists, Falmouth - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Falmouth
- Other Attorneys & Lawyers, Falmouth
- Other Attorneys & Lawyers, Falmouth
- Other Building Materials & Supplies, Falmouth
- Other Lawyers & Attorneys, Falmouth
- Other Lodging, Falmouth
- Outdoor & Lawn & Garden Equipment Repair & Service, Falmouth
- Outdoor Equipment & Accessories, Falmouth
- Outpatient Services, Falmouth - Outpatient Care
- Outsourcing Services, Falmouth
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