- Occupational Health & Safety, Lanham
- Occupational Health Care Professionals, Lanham
- Office Buildings & Parks, Lanham
- Office Space on Rent, Lanham - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Lanham
- Oil Change & Lubrication, Lanham - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lanham
- Opticians, Lanham
- Optometrists, Lanham - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Lanham - Eye Clinics
- Oral Surgeon, Lanham - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Nursery, Lanham
- Ornamental Nursery Services, Lanham
- Orthodox Churches, Lanham
- Orthopedists, Lanham - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Lanham
- Outdoor Equipment & Accessories, Lanham
- Outdoor Furniture & Patio Furniture, Lanham - Garden Furniture Stores
- Outpatient Services, Lanham - Outpatient Care
- Outsourcing Services, Lanham
- Overhead Door, Lanham
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