- Obstetricians & Gynecologists, Glendora - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Glendora
- Oil Change & Lubrication, Glendora - Auto Oil & Quick Lube
- Oil Treating Compounds, Glendora
- Oncologists, Glendora - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Glendora
- Ophthalmologists, Glendora - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Glendora
- Opticians, Glendora
- Optometrists, Glendora - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Glendora - Eye Clinics
- Oral Surgeon, Glendora - Dentists - Oral & Maxillofacial Surgeons
- Oriental Massage, Glendora
- Ornamental Nursery, Glendora
- Ornamental Nursery Services, Glendora
- Orthopedists, Glendora - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Glendora
- Other Lodging, Glendora
- Outdoor & Lawn & Garden Equipment Repair & Service, Glendora
- Outdoor Equipment & Accessories, Glendora
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