- Occupational Health Care Professionals, Belton
- Occupational Therapy, Belton - Occupational Health Specialists
- Off Road Vehicles, Belton
- Off Road Vehicles Parts & Accessories, Belton
- Office Supplies, Equipment & Office Furniture Stores, Belton
- Oil & Gas Exploration & Development, Belton - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Belton - Auto Oil & Quick Lube
- Oil Field Contractors, Belton
- Oil Industry & Oil Field Equipment & Services, Belton - Oil Companies
- Oil Refinery, Belton
- Opticians, Belton
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- Optometrists, Belton - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Belton
- Ornamental Nursery, Belton
- Ornamental Nursery Services, Belton
- Other Building Materials & Supplies, Belton
- Outdoor & Lawn & Garden Equipment Repair & Service, Belton
- Outdoor Equipment & Accessories, Belton
- Outpatient Services, Belton - Outpatient Care
- Overhead Door, Belton
- Oxygen & Respiratory Equipment & Supplies, Belton - Oxygen Concentrator, Tank, Machine, etc
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