- Occupational Health & Safety, Racine
- Occupational Health Care Physicians & Surgeons, Racine - Occupational Medicine
- Occupational Health Care Professionals, Racine
- Occupational Medicine Doctors, Racine - Physicians & Surgeons
- Off Road Vehicles, Racine
- Off Road Vehicles Parts & Accessories, Racine
- Office & Meeting Equipment & Supplies Rental, Racine
- Office Buildings & Parks, Racine
- Office Furniture & Equipment Rental & Leasing, Racine
- Office Supplies, Equipment & Office Furniture Stores, Racine
- Oil Change & Lubrication, Racine - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Racine
- Oil Industry & Oil Field Equipment & Services, Racine - Oil Companies
- Old Age Homes Service, Racine
- Oncologists, Racine - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Racine - Internet Advertising
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Racine
- Opticians, Racine
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- Optometrists, Racine - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Racine
- Ornamental Nursery Services, Racine
- Other Attorneys & Lawyers, Racine
- Other Attorneys & Lawyers, Racine
- Other Building Materials & Supplies, Racine
- Other Industrial Contractors, Racine
- Other Lawyers & Attorneys, Racine
- Other Office Supply Stores, Racine
- Other Specialties, Racine - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Racine
- Outdoor Equipment & Accessories, Racine
- Outdoor Furniture & Patio Furniture, Racine - Garden Furniture Stores
- Outerwear Stores, Racine - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Racine - Care & Treatment Centers
- Outpatient Services, Racine - Outpatient Care
- Overhead Door, Racine
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