- Obstetricians & Gynecologists, Simi Valley - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Simi Valley - Occupational Medicine
- Occupational Health Care Professionals, Simi Valley
- Occupational Medicine Doctors, Simi Valley - Physicians & Surgeons
- Occupational Therapy, Simi Valley - Occupational Health Specialists
- Office Buildings & Parks, Simi Valley
- Office Equipment & Supplies Manufacturers, Simi Valley
- Office Supplies, Equipment & Office Furniture Stores, Simi Valley
- Oil & Gas Investments, Simi Valley
- Oil Change & Lubrication, Simi Valley - Auto Oil & Quick Lube
- Oncologists, Simi Valley - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Simi Valley - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Simi Valley - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Simi Valley
- Opticians, Simi Valley
- Optometrists, Simi Valley - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Simi Valley - Dentists - Oral & Maxillofacial Surgeons
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- Organ Donation & Tissue Banks, Simi Valley
- Oriental Restaurants, Simi Valley
- Ornamental Iron - Residential, Simi Valley - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Simi Valley - Steel, Iron, Bronze, etc
- Ornamental Nursery, Simi Valley
- Ornamental Nursery Services, Simi Valley
- Orthodontist, Simi Valley - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Simi Valley - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Simi Valley
- Other Attorneys & Lawyers, Simi Valley
- Other Building Materials & Supplies, Simi Valley
- Other Lawyers & Attorneys, Simi Valley
- Other Lodging, Simi Valley
- Outdoor & Lawn & Garden Equipment Repair & Service, Simi Valley
- Outdoor Equipment & Accessories, Simi Valley
- Outerwear Stores, Simi Valley - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Ownership Organizations, Simi Valley
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