- Obstetricians & Gynecologists, Azusa - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Azusa
- Oil & Gas Exploration & Development, Azusa - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Azusa - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Azusa - Oil Companies
- Oncologists, Azusa - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optometrists, Azusa - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Massage, Azusa
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- Ornamental Iron - Residential, Azusa - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Azusa - Steel, Iron, Bronze, etc
- Ornamental Nursery, Azusa
- Ornamental Nursery Services, Azusa
- Other Building Materials & Supplies, Azusa
- Outdoor & Lawn & Garden Equipment Repair & Service, Azusa
- Outdoor Advertising & Billboard, Azusa
- Outdoor Equipment & Accessories, Azusa
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