- Occupational Health Care Professionals, Schererville
- Occupational Therapy, Schererville - Occupational Health Specialists
- Office Buildings & Parks, Schererville
- Office Supplies, Equipment & Office Furniture Stores, Schererville
- Oil & Gas Companies, Schererville
- Oil & Petroleum Products, Schererville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Schererville - Auto Oil & Quick Lube
- Omelette & Quiche Restaurants, Schererville
- Online Advertising, Schererville - Internet Advertising
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Schererville
- Optometrists, Schererville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Schererville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Schererville
- Ornamental Nursery Services, Schererville
- Orthodontist, Schererville - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Schererville
- Other Attorneys & Lawyers, Schererville
- Other Building Materials & Supplies, Schererville
- Other Lawyers & Attorneys, Schererville
- Outdoor Equipment & Accessories, Schererville
- Outpatient Services, Schererville - Outpatient Care
- Ownership Organizations, Schererville
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