- Obstetricians & Gynecologists, Janesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Janesville
- Occupational Health Care Physicians & Surgeons, Janesville - Occupational Medicine
- Occupational Health Care Professionals, Janesville
- Occupational Medicine Doctors, Janesville - Physicians & Surgeons
- Occupational Therapy, Janesville - Occupational Health Specialists
- Off Road Vehicles, Janesville
- Off Road Vehicles Parts & Accessories, Janesville
- Office Buildings & Parks, Janesville
- Office Partitions & Dividers, Janesville
- Office Space on Rent, Janesville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Janesville
- Oil & Gas Companies, Janesville
- Oil & Petroleum Products, Janesville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Janesville - Auto Oil & Quick Lube
- Oil Handling Equipment & Supplies, Janesville
- Oncologists, Janesville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Janesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Janesville
- Opticians, Janesville
- Optometrists, Janesville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Janesville - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Janesville
- Ornamental Nursery, Janesville
- Ornamental Nursery Products, Janesville
- Ornamental Nursery Services, Janesville
- Orthodontist, Janesville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Janesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Janesville
- Other Attorneys & Lawyers, Janesville
- Other Building Materials & Supplies, Janesville
- Other Lawyers & Attorneys, Janesville
- Other Lodging, Janesville
- Other Office Supply Stores, Janesville
- Other Specialties, Janesville - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Janesville
- Outdoor Advertising & Billboard, Janesville
- Outdoor Equipment & Accessories, Janesville
- Outdoor Furniture & Patio Furniture, Janesville - Garden Furniture Stores
- Outerwear Stores, Janesville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Janesville - Care & Treatment Centers
- Outpatient Services, Janesville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Janesville - Oxygen Concentrator, Tank, Machine, etc
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