- Obstetricians & Gynecologists, Dayton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Dayton
- Occupational Health Care Professionals, Dayton
- Occupational Therapy, Dayton - Occupational Health Specialists
- Office Buildings & Parks, Dayton
- Office Furniture & Equipment Repair & Refinish, Dayton
- Office Partitions & Dividers, Dayton
- Office Planning & Design, Dayton
- Office Space on Rent, Dayton - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Dayton
- Offset Printing, Dayton
- Oil & Gas Companies, Dayton
- Oil & Gas Exploration & Development, Dayton - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Dayton - Merchant, Wholesalers, etc
- Oil Burners, Dayton
- Oil Change & Lubrication, Dayton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Dayton - Oil Companies
- Oils Cutting, Dayton
- Oils Fuel Treatment Compounds, Dayton
- Oils Industrial, Dayton
- Oncologists, Dayton - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Dayton - Internet Advertising
- Open Bible Church, Dayton
- Ophthalmologists, Dayton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Dayton
- Optical Goods Repair & Service, Dayton - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Dayton
- Opticians, Dayton
- Optometrists, Dayton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Dayton - Dentists - Oral & Maxillofacial Surgeons
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- Orchestras, Symphonies & Bands, Dayton
- Organ Donation & Tissue Banks, Dayton
- Oriental Restaurants, Dayton
- Ornamental Greenhouses, Dayton
- Ornamental Metal Work, Dayton - Steel, Iron, Bronze, etc
- Ornamental Nursery, Dayton
- Ornamental Nursery Products, Dayton
- Ornamental Nursery Services, Dayton
- Orthodontist, Dayton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Dayton - Orthopedic Shoes
- Orthopedic Appliances, Dayton
- Orthopedic Shoes, Dayton
- Orthopedists, Dayton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Dayton - Physicians & Surgeons
- Other Attorneys & Lawyers, Dayton
- Other Attorneys & Lawyers, Dayton
- Other Building Materials & Supplies, Dayton
- Other Electrical Products, Dayton
- Other Lawyers & Attorneys, Dayton
- Other Lodging, Dayton
- Outdoor & Lawn & Garden Equipment Repair & Service, Dayton
- Outdoor Advertising & Billboard, Dayton
- Outdoor Equipment & Accessories, Dayton
- Outdoor Furniture & Patio Furniture, Dayton - Garden Furniture Stores
- Outerwear Stores, Dayton - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Dayton - Care & Treatment Centers
- Outpatient Services, Dayton - Outpatient Care
- Overhead Door, Dayton
- Ownership Organizations, Dayton
- Oxygen & Respiratory Equipment & Supplies, Dayton - Oxygen Concentrator, Tank, Machine, etc
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