- Office Partitions & Dividers, Yardley
- Office Supplies, Equipment & Office Furniture Stores, Yardley
- Oil & Gas Exploration & Development, Yardley - Oil Field Exploration, Monitoring & Remediation
- Oil Industry & Oil Field Equipment & Services, Yardley - Oil Companies
- Ophthalmologists, Yardley - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Yardley
- Opticians, Yardley
- Optometrists, Yardley - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Yardley - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Yardley
- Ornamental Greenhouses, Yardley
- Ornamental Nursery, Yardley
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- Ornamental Nursery Services, Yardley
- Orthodontist, Yardley - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Synagogues, Yardley
- Orthopedic & Prosthetic Appliances & Shoes, Yardley - Orthopedic Shoes
- Orthopedists, Yardley - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Yardley
- Other Attorneys & Lawyers, Yardley
- Other Building Materials & Supplies, Yardley
- Other Lawyers & Attorneys, Yardley
- Other Lodging, Yardley
- Outdoor & Lawn & Garden Equipment Repair & Service, Yardley
- Ownership Organizations, Yardley
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