- Obstetricians & Gynecologists, Coatesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Coatesville
- Occupational Therapy, Coatesville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Coatesville
- Oil & Gas Companies, Coatesville
- Oil Change & Lubrication, Coatesville - Auto Oil & Quick Lube
- Ophthalmologists, Coatesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Coatesville
- Opticians, Coatesville
- Optometrists, Coatesville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchard Service, Coatesville
- Ornamental Greenhouses, Coatesville
- Ornamental Nursery, Coatesville
- Ornamental Nursery Services, Coatesville
- Orthodontist, Coatesville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Coatesville
- Other Building Materials & Supplies, Coatesville
- Other Lodging, Coatesville
- Outdoor Equipment & Accessories, Coatesville
- Outpatient Services, Coatesville - Outpatient Care
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