- Obstetricians & Gynecologists, Gaithersburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Gaithersburg - Occupational Medicine
- Occupational Health Care Professionals, Gaithersburg
- Occupational Medicine Doctors, Gaithersburg - Physicians & Surgeons
- Off Road Vehicles, Gaithersburg
- Off Road Vehicles Parts & Accessories, Gaithersburg
- Office Buildings & Parks, Gaithersburg
- Office Supplies, Equipment & Office Furniture Stores, Gaithersburg
- Oil & Petroleum Products, Gaithersburg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Gaithersburg - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Gaithersburg
- Opticians, Gaithersburg
- Optometrists, Gaithersburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Gaithersburg
- Orchestras, Symphonies & Bands, Gaithersburg
- Organizing Consultants, Gaithersburg
- Oriental Goods & Products Stores, Gaithersburg
- Oriental Restaurants, Gaithersburg
- Oriental Rugs, Gaithersburg
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- Ornamental Nursery, Gaithersburg
- Ornamental Nursery Services, Gaithersburg
- Orthodontist, Gaithersburg - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Gaithersburg
- Orthodox Synagogues, Gaithersburg
- Orthopedic & Prosthetic Appliances & Shoes, Gaithersburg - Orthopedic Shoes
- Orthopedists, Gaithersburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Gaithersburg
- Other Electrical Products, Gaithersburg
- Other Office Supply Stores, Gaithersburg
- Other Specialties, Gaithersburg - Doctors, Physicians & Surgeons
- Outdoor Centers, Gaithersburg
- Outdoor Equipment & Accessories, Gaithersburg
- Outdoor Furniture & Patio Furniture, Gaithersburg - Garden Furniture Stores
- Outdoor Power Equipment Repair, Gaithersburg
- Outerwear & Accessories Manufacturers, Gaithersburg
- Outerwear Stores, Gaithersburg - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Gaithersburg
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