- Obstetricians & Gynecologists, Evansville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Evansville
- Occupational Therapy, Evansville - Occupational Health Specialists
- Off Road Vehicles, Evansville
- Off Road Vehicles Parts & Accessories, Evansville
- Office Buildings & Parks, Evansville
- Office Equipment & Supplies Manufacturers, Evansville
- Office Supplies, Equipment & Office Furniture Stores, Evansville
- Oil & Gas Companies, Evansville
- Oil & Gas Exploration & Development, Evansville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Evansville - Companies
- Oil & Grease Seals, Evansville
- Oil & Petroleum Products, Evansville - Merchant, Wholesalers, etc
- Oil Brokers, Evansville
- Oil Change & Lubrication, Evansville - Auto Oil & Quick Lube
- Oil Field Contractors, Evansville
- Oil Industry & Oil Field Equipment & Services, Evansville - Oil Companies
- Oil Petroleum Wholesale, Evansville
- Oil Refinery, Evansville
- Oil Synthetic, Evansville
- Oils Recycling, Evansville
- Oncologists, Evansville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Evansville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Evansville
- Optical Goods Repair & Service, Evansville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Evansville
- Opticians, Evansville
- Optometrists, Evansville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Evansville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Evansville
- Ornamental Greenhouses, Evansville
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- Ornamental Metal Work, Evansville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Evansville
- Ornamental Nursery Services, Evansville
- Orthodontist, Evansville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Evansville - Orthopedic Shoes
- Orthopedists, Evansville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Evansville
- Osteoporosis Doctors, Evansville - Physicians & Surgeons
- Other Building Materials & Supplies, Evansville
- Other Electrical Products, Evansville
- Other Industrial Contractors, Evansville
- Other Lodging, Evansville
- Other Office Supply Stores, Evansville
- Other Specialties, Evansville - Doctors, Physicians & Surgeons
- Outboard Motors, Evansville
- Outboard Motors Parts & Repair, Evansville
- Outdoor & Lawn & Garden Equipment Repair & Service, Evansville
- Outdoor Advertising & Billboard, Evansville
- Outdoor Equipment & Accessories, Evansville
- Outdoor Furniture, Evansville
- Outdoor Furniture & Patio Furniture, Evansville - Garden Furniture Stores
- Outerwear Stores, Evansville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Evansville - Care & Treatment Centers
- Outpatient Services, Evansville - Outpatient Care
- Outplacement Consultants, Evansville
- Outplacement Counseling, Evansville
- Outplacement Services, Evansville
- Outsourcing Services, Evansville
- Overhead Door, Evansville
- Oxygen & Respiratory Equipment & Supplies, Evansville - Oxygen Concentrator, Tank, Machine, etc
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