- Obstetricians & Gynecologists, Deland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Deland
- Office Supplies, Equipment & Office Furniture Stores, Deland
- Oil Change & Lubrication, Deland - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Deland - Oil Companies
- Oil Petroleum Wholesale, Deland
- Oncologists, Deland - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Bible Church, Deland
- Open Door Church, Deland
- Ophthalmologists, Deland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Deland - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Deland
- Opticians, Deland
- Optometrists, Deland - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Deland - Eye Clinics
- Oral Surgeon, Deland - Dentists - Oral & Maxillofacial Surgeons
- Organs Tuning & Repair, Deland
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- Oriental Restaurants, Deland
- Ornamental Iron Work, Deland
- Ornamental Metal Work, Deland - Steel, Iron, Bronze, etc
- Ornamental Nursery, Deland
- Ornamental Nursery Services, Deland
- Orthodontist, Deland - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Deland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Deland
- Other Attorneys & Lawyers, Deland
- Other Building Materials & Supplies, Deland
- Other Lawyers & Attorneys, Deland
- Outboard Motors, Deland
- Outdoor & Lawn & Garden Equipment Repair & Service, Deland
- Outdoor Equipment & Accessories, Deland
- Outdoor Furniture, Deland
- Outpatient Services, Deland - Outpatient Care
- Ownership Organizations, Deland
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