- Obstetricians & Gynecologists, Elk River - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Elk River
- Occupational Health Care Professionals, Elk River
- Office Supplies, Equipment & Office Furniture Stores, Elk River
- Oil & Petroleum Products, Elk River - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Elk River - Auto Oil & Quick Lube
- Ophthalmologists, Elk River - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Elk River
- Opticians, Elk River
- Optometrists, Elk River - Eye Doctors, Physicians & Surgeons (Optometry)
- Organs Tuning & Repair, Elk River
- Ornamental Greenhouses, Elk River
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- Ornamental Metal Work, Elk River - Steel, Iron, Bronze, etc
- Ornamental Nursery, Elk River
- Ornamental Nursery Services, Elk River
- Orthodontist, Elk River - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Elk River - Orthopedic Shoes
- Orthopedists, Elk River - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Elk River
- Other Electrical Products, Elk River
- Outdoor & Lawn & Garden Equipment Repair & Service, Elk River
- Outdoor Equipment & Accessories, Elk River
- Overhead Door, Elk River
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