- Obstetricians & Gynecologists, Carmichael - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Carmichael - Occupational Medicine
- Occupational Health Care Professionals, Carmichael
- Occupational Medicine Doctors, Carmichael - Physicians & Surgeons
- Off Road Vehicles, Carmichael
- Off Road Vehicles Parts & Accessories, Carmichael
- Office Supplies, Equipment & Office Furniture Stores, Carmichael
- Oil & Gas Companies, Carmichael
- Oil Change & Lubrication, Carmichael - Auto Oil & Quick Lube
- Online Advertising, Carmichael - Internet Advertising
- Ophthalmologists, Carmichael - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, Carmichael
- Optometrists, Carmichael - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Carmichael - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Carmichael
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- Oriental Restaurants, Carmichael
- Ornamental Nursery, Carmichael
- Ornamental Nursery Products, Carmichael
- Ornamental Nursery Services, Carmichael
- Orthodontist, Carmichael - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Carmichael - Orthopedic Shoes
- Orthopedists, Carmichael - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Carmichael
- Other Building Materials & Supplies, Carmichael
- Outdoor & Lawn & Garden Equipment Repair & Service, Carmichael
- Outdoor Equipment & Accessories, Carmichael
- Outpatient Services, Carmichael - Outpatient Care
- Overhead Door, Carmichael
- Ownership Organizations, Carmichael
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