- Accounting, Auditing & Bookkeeping Services, Clarksville
- Additional Educational Opportunities, Clarksville
- Adventist Churches, Clarksville
- Agricultural Insurance, Clarksville
- Agriculture, Clarksville
- Airport, Clarksville
- Alarm Systems, Clarksville
- Alarms, Signaling & Security Equipment & Systems, Clarksville
- Animal Feeds, Clarksville
- Animal Hospitals, Clarksville - Veterinary Clinic & Hospital
- Animal Protection Organizations, Clarksville
- Animal Shelters & Protection Agencies, Clarksville
- Animals, Clarksville
- Antique Repair & Restoration, Clarksville
- Antique Stores, Clarksville - Antique Mall, Dealers & Shops
- Apartments & Buildings, Clarksville
- Apparel Manufacturers, Clarksville
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- Appliance Parts, Clarksville
- Appliance Repair & Service, Clarksville
- Archery Supplies & Equipment Stores, Clarksville - Bows, Arrows, Targets & Accessories
- Armored Car Service, Clarksville
- Arts & Crafts Supplies & Stores, Clarksville
- Arts & Culture, Clarksville
- Asian Restaurants, Clarksville
- Atm Machines, Clarksville
- Attorneys & Lawyers, Clarksville
- Attorneys & Lawyers, Clarksville
- Auto Body Repair & Paint Shop, Clarksville - Auto Body Shop
- Auto Insurance, Clarksville
- Auto Parts, Accessories, Equipment & Supplies, Clarksville
- Auto Repair Shops & Maintenance Service, Clarksville - Auto Mechanic & Car Repair Shops
- Auto Services, Clarksville
- Automobile Performance, Racing & Sports Car Equipment, Clarksville
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