- Accounting, Auditing & Bookkeeping Services, Boonsboro
- Acupressure & Acupuncture Specialists, Boonsboro
- Additional Educational Opportunities, Boonsboro
- Administrative Organizations, Boonsboro
- Adult & Geriatric Social Services, Boonsboro
- Adventist Churches, Boonsboro
- Advertising, PR & Marketing Services, Boonsboro
- Agents Brokers & Planning Services, Boonsboro
- Agriculture, Boonsboro
- Air Conditioning Repair & Service, Boonsboro - HVAC - Cooling & Heating Repair
- Air Duct Cleaning, Boonsboro - Heating & Air Conditioning Systems
- Alarm Systems, Boonsboro
- Ambulance Department, Boonsboro
- American Legions, Boonsboro
- Animal Feeds, Boonsboro
- Animal Hospitals, Boonsboro - Veterinary Clinic & Hospital
- Animal Shelters & Protection Agencies, Boonsboro
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- Apartment Building Operators, Boonsboro
- Apartments & Buildings, Boonsboro
- Art Galleries & Dealers, Boonsboro
- Arts & Culture, Boonsboro
- Assisted Living Facilities, Boonsboro
- Attorneys & Lawyers, Boonsboro
- Attorneys & Lawyers, Boonsboro
- ATV & RV Dealers, Boonsboro - All-Terrain & Recreational Vehicles
- Auctions, Boonsboro - Auctioneer Services
- Auto Body Repair & Paint Shop, Boonsboro - Auto Body Shop
- Auto Diagnostic Services, Boonsboro - Auto Inspection & Testing Services
- Auto Parts, Accessories, Equipment & Supplies, Boonsboro
- Auto Repair Shops & Maintenance Service, Boonsboro - Auto Mechanic & Car Repair Shops
- Auto Services, Boonsboro
- Auto Utility Trailers, Boonsboro
- Auto, Car & Truck Accessories, Boonsboro
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