- Obstetricians & Gynecologists, Colleyville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Colleyville
- Oil & Gas Exploration & Development, Colleyville - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Colleyville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Colleyville - Oil Companies
- Ophthalmologists, Colleyville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Colleyville
- Optometrists, Colleyville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Colleyville
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- Ornamental Nursery Services, Colleyville
- Orthodontist, Colleyville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Colleyville
- Osteoporosis Doctors, Colleyville - Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Colleyville
- Outdoor Equipment & Accessories, Colleyville
- Outdoor Furniture, Colleyville
- Outdoor Furniture & Patio Furniture, Colleyville - Garden Furniture Stores
- Overhead Door, Colleyville
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