- Obstetricians & Gynecologists, Lake Geneva - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Lake Geneva
- Oil & Gas Producers, Lake Geneva - Companies
- Oil & Petroleum Products, Lake Geneva - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Lake Geneva - Oil Companies
- Oil Refinery, Lake Geneva
- Old Age Homes Service, Lake Geneva
- Online Advertising, Lake Geneva - Internet Advertising
- Ophthalmologists, Lake Geneva - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lake Geneva
- Opticians, Lake Geneva
- Optometrists, Lake Geneva - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Lake Geneva - Eye Clinics
- Oral Surgeon, Lake Geneva - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Lake Geneva
- Ornamental Nursery, Lake Geneva
- Ornamental Nursery Products, Lake Geneva
- Ornamental Nursery Services, Lake Geneva
- Orthodontist, Lake Geneva - Teeth Straightening, Invisalign & Dental Braces
- Orthotics and Prosthetics, Lake Geneva
- Other Building Materials & Supplies, Lake Geneva
- Outdoor Equipment & Accessories, Lake Geneva
- Outpatient Clinics, Lake Geneva - Care & Treatment Centers
- Ownership Organizations, Lake Geneva
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