- Obstetricians & Gynecologists, Irwin - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Irwin
- Occupational Therapy, Irwin - Occupational Health Specialists
- Office Buildings & Parks, Irwin
- Office Supplies, Equipment & Office Furniture Stores, Irwin
- Oil & Gas Companies, Irwin
- Oil & Petroleum Products, Irwin - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Irwin - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Irwin - Oil Companies
- Opticians, Irwin
- Optometrists, Irwin - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Irwin
- Ornamental Nursery, Irwin
- Ornamental Nursery Services, Irwin
- Orthodontist, Irwin - Teeth Straightening, Invisalign & Dental Braces
- Osteoporosis Doctors, Irwin - Physicians & Surgeons
- Other Building Materials & Supplies, Irwin
- Outdoor & Lawn & Garden Equipment Repair & Service, Irwin
- Outdoor Advertising & Billboard, Irwin
- Outdoor Equipment & Accessories, Irwin
- Outdoor Furniture & Patio Furniture, Irwin - Garden Furniture Stores
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