- Obstetricians & Gynecologists, Galveston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Galveston
- Off Road Vehicles Parts & Accessories, Galveston
- Office Buildings & Parks, Galveston
- Office Space on Rent, Galveston - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Galveston
- Oil & Gas Exploration & Development, Galveston - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Well Drilling Services, Galveston
- Oil Change & Lubrication, Galveston - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Galveston - Oil Companies
- Oil Well Equipment & Supplies, Galveston
- Ophthalmologists, Galveston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Galveston - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Galveston
- Opticians, Galveston
- Optometrists, Galveston - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Galveston - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Galveston
- Ornamental Nursery Products, Galveston
- Ornamental Nursery Services, Galveston
- Orthodontist, Galveston - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Galveston
- Orthopedic & Prosthetic Appliances & Shoes, Galveston - Orthopedic Shoes
- Osteoporosis Doctors, Galveston - Physicians & Surgeons
- Other Building Materials & Supplies, Galveston
- Other Industrial Contractors, Galveston
- Other Lodging, Galveston
- Outdoor Advertising & Billboard, Galveston
- Outdoor Equipment & Accessories, Galveston
- Outdoor Furniture & Patio Furniture, Galveston - Garden Furniture Stores
- Outpatient Clinics, Galveston - Care & Treatment Centers
- Outpatient Services, Galveston - Outpatient Care
- Overhead Door, Galveston
- Oxygen & Respiratory Equipment & Supplies, Galveston - Oxygen Concentrator, Tank, Machine, etc
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