- Accounting, Auditing & Bookkeeping Services, Poolesville
- Additional Educational Opportunities, Poolesville
- Adult & Geriatric Social Services, Poolesville
- Agricultural & Crop Shipping, Poolesville
- Agriculture, Poolesville
- Air Conditioning Repair & Service, Poolesville - HVAC - Cooling & Heating Repair
- Air Conditioning Units & Heating Systems, Poolesville - HVAC Supplies & Equipments
- Alarm Systems, Poolesville
- Anglican Churches, Poolesville
- Animal Hospitals, Poolesville - Veterinary Clinic & Hospital
- Animal Training, Poolesville
- Animals, Poolesville
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- Art Galleries & Dealers, Poolesville
- Art Supplies, Poolesville - Art Stores
- Arts & Crafts Supplies & Stores, Poolesville
- Arts & Culture, Poolesville
- Asian Restaurants, Poolesville
- Athletic Facilities & Services, Poolesville
- Attorneys & Lawyers, Poolesville
- Attorneys & Lawyers, Poolesville
- Auto Body Repair & Paint Shop, Poolesville - Auto Body Shop
- Auto Parts, Accessories, Equipment & Supplies, Poolesville
- Auto Repair Shops & Maintenance Service, Poolesville - Auto Mechanic & Car Repair Shops
- Auto Services, Poolesville
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