- Obstetricians & Gynecologists, Piqua - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Piqua
- Occupational Health Care Professionals, Piqua
- Office Supplies, Equipment & Office Furniture Stores, Piqua
- Oil Change & Lubrication, Piqua - Auto Oil & Quick Lube
- Ophthalmologists, Piqua - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Piqua
- Opticians, Piqua
- Optometrists, Piqua - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Piqua - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Piqua
- Ornamental Nursery, Piqua
- Ornamental Nursery Products, Piqua
- Ornamental Nursery Services, Piqua
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- Orthodontist, Piqua - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic Shoes, Piqua
- Orthotics and Prosthetics, Piqua
- Osteoporosis Doctors, Piqua - Physicians & Surgeons
- Other Building Materials & Supplies, Piqua
- Other Office Supply Stores, Piqua
- Outdoor Centers, Piqua
- Outdoor Equipment & Accessories, Piqua
- Outdoor Power Equipment, Piqua
- Outdoor Power Equipment Repair, Piqua
- Outpatient Clinics, Piqua - Care & Treatment Centers
- Outpatient Services, Piqua - Outpatient Care
- Overhead Door, Piqua
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