- Obstetricians & Gynecologists, Killeen - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Killeen
- Occupational Therapy, Killeen - Occupational Health Specialists
- Office Machinery, Killeen
- Office Supplies, Equipment & Office Furniture Stores, Killeen
- Oil Change & Lubrication, Killeen - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Killeen - Oil Companies
- Oncologists, Killeen - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Killeen - Internet Advertising
- Ophthalmologists, Killeen - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Killeen
- Opticians, Killeen
- Optometrists, Killeen - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Killeen - Eye Clinics
- Oral Surgeon, Killeen - Dentists - Oral & Maxillofacial Surgeons
- Oriental Food Products, Killeen
- Oriental Goods & Products Stores, Killeen
- Oriental Restaurants, Killeen
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- Ornamental Nursery, Killeen
- Ornamental Nursery Services, Killeen
- Orthodontist, Killeen - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Killeen - Orthopedic Shoes
- Orthopedists, Killeen - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Killeen
- Other Attorneys & Lawyers, Killeen
- Other Building Materials & Supplies, Killeen
- Other Electrical Products, Killeen
- Other Lawyers & Attorneys, Killeen
- Other Lodging, Killeen
- Outdoor & Lawn & Garden Equipment Repair & Service, Killeen
- Outdoor Advertising & Billboard, Killeen
- Outdoor Equipment & Accessories, Killeen
- Outdoor Furniture & Patio Furniture, Killeen - Garden Furniture Stores
- Outerwear Stores, Killeen - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Killeen - Outpatient Care
- Overhead Door, Killeen
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