- Obstetricians & Gynecologists, Titusville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Titusville
- Oil & Gas Producers, Titusville - Companies
- Oil Change & Lubrication, Titusville - Auto Oil & Quick Lube
- Oil Purification Equipment, Titusville
- Ophthalmologists, Titusville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optometrists, Titusville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Titusville
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