- Obstetricians & Gynecologists, Buffalo - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Buffalo
- Occupational Health Care Physicians & Surgeons, Buffalo - Occupational Medicine
- Occupational Health Care Professionals, Buffalo
- Occupational Therapy, Buffalo - Occupational Health Specialists
- Off Road Vehicles, Buffalo
- Off Road Vehicles Parts & Accessories, Buffalo
- Office Buildings & Parks, Buffalo
- Office Equipment & Supplies Manufacturers, Buffalo
- Office Furniture Manufacturers, Buffalo
- Office Machinery, Buffalo
- Office Partitions & Dividers, Buffalo
- Office Space on Rent, Buffalo - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Buffalo
- Offset & Photolithographic Printing, Buffalo
- Offset Printing, Buffalo
- Oil & Gas Companies, Buffalo
- Oil & Gas Exploration & Development, Buffalo - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Buffalo - Companies
- Oil & Petroleum Products, Buffalo - Merchant, Wholesalers, etc
- Oil Brokers, Buffalo
- Oil Change & Lubrication, Buffalo - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Buffalo - Oil Companies
- Oil Petroleum Wholesale, Buffalo
- Oil Refinery, Buffalo
- Oilfield Trucking, Buffalo
- Oncologists, Buffalo - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Buffalo - Internet Advertising
- Online Shopping Malls, Buffalo
- Opera Companies, Buffalo
- Ophthalmic Goods, Buffalo
- Ophthalmologists, Buffalo - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Buffalo - Camera Repair
- Optical Instruments & Lenses Manufacturers, Buffalo
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Buffalo
- Opticians, Buffalo
- Optometrists, Buffalo - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Buffalo - Eye Clinics
- Oral Surgeon, Buffalo - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Buffalo
- Organ Donation & Tissue Banks, Buffalo
- Organizing Services & Products – Household & Business, Buffalo
- Oriental Goods & Products Stores, Buffalo
- Ornamental Greenhouses, Buffalo
- Ornamental Metal Work, Buffalo - Steel, Iron, Bronze, etc
- Ornamental Nursery, Buffalo
- Ornamental Nursery Products, Buffalo
- Ornamental Nursery Services, Buffalo
- Orthodontist, Buffalo - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Buffalo
- Orthopedic & Prosthetic Appliances & Shoes, Buffalo - Orthopedic Shoes
- Orthopedic Shoes, Buffalo
- Orthopedists, Buffalo - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Buffalo
- Other Attorneys & Lawyers, Buffalo
- Other Attorneys & Lawyers, Buffalo
- Other Building Materials & Supplies, Buffalo
- Other Electrical Products, Buffalo
- Other Industrial Goods, Buffalo
- Other Lawyers & Attorneys, Buffalo
- Other Lodging, Buffalo
- Other Office Supply Stores, Buffalo
- Other Specialties, Buffalo - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Buffalo
- Outdoor Advertising & Billboard, Buffalo
- Outdoor Equipment & Accessories, Buffalo
- Outdoor Furniture & Patio Furniture, Buffalo - Garden Furniture Stores
- Outerwear & Accessories Manufacturers, Buffalo
- Outerwear Stores, Buffalo - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Buffalo - Care & Treatment Centers
- Outpatient Services, Buffalo - Outpatient Care
- Outplacement Consultants, Buffalo
- Outsourcing Services, Buffalo
- Oxygen & Respiratory Equipment & Supplies, Buffalo - Oxygen Concentrator, Tank, Machine, etc
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