- Office Supplies, Equipment & Office Furniture Stores, Montoursville
- Oil & Gas Companies, Montoursville
- Oil & Gas Exploration & Development, Montoursville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Montoursville - Companies
- Oil & Petroleum Products, Montoursville - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Montoursville - Oil Companies
- Oil Well Equipment & Supplies, Montoursville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Montoursville
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- Opticians, Montoursville
- Optometrists, Montoursville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Montoursville
- Ornamental Nursery Services, Montoursville
- Orthodontist, Montoursville - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Montoursville
- Outdoor Equipment & Accessories, Montoursville
- Oxygen & Respiratory Equipment & Supplies, Montoursville - Oxygen Concentrator, Tank, Machine, etc
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