| Animal Shelters | 25 |
| Annuities | 25 |
| Antennas | 25 |
| Antiques-Dealers | 25 |
| Antiques-Dealers-Whsle | 27 |
| Antiques-Repairing & Restoring | 27 |
| Antiques-Reproductions | 27 |
| Apartment Finding & Rental Service | 28 |
| Apartments | 28 |
| Apartments-Corporate | 28 |
| Appliances-Household-Major-Dealers | 29 |
| Appliances-Household-Major-Parts & Supplies | 29 |
| Appliances-Household-Major-Service, Repair & | 30 |
| Installation |
| Appliances-Household-Major-Used | 31 |
| Appliances-Household-Small-Service & Repair | 31 |
| Appliances-Household-Small-Used | 31 |
| Appraisers | 31 |
| Aquarium & Aquarium Supplies-Whsle & Mfrs | 31 |
| Aquariums & Aquarium Supplies-Dealers | 31 |
| Aquariums-Public | 32 |
| Arborists | 32 |
| Architects | 32 |
| Architectural & Construction Specifications | 34 |
| Armored Car Service | 34 |
| Aromatherapy | 34 |
| Art Associations | 34 |
| Art Galleries Dealers & Consultants | 34 |
| Art Goods | 36 |
| Art Instruction & Schools | 36 |
| Art Restoration & Conservation | 36 |
| Art Supplies | 36 |
| Artificial Breasts | 36 |
| Artificial Limbs | 36 |
| Artists | 36 |
| Artists-Commercial | 36 |
| Artists-Fine Arts | 36 |
| Arts Organizations & Information | 37 |
| Asbestos Inspection, Removal & Consulting | 37 |
| Services |
| Asphalt & Asphalt Products | 37 |
| Assisted Living | 37 |
| Association Management | 37 |
| Associations | 37 |
| Athletic Fields, Stadiums & Arenas | 39 |
| Athletic Organizations | 39 |
| Attorneys | 39 |
| Attorneys-Admiralty & Maritime Law | 59 |
| Attorneys-Appellate Practice | 59 |
| Attorneys-Bankruptcy | 59 |
| Attorneys-Bankruptcy-Business | 59 |
| Attorneys-Bankruptcy-Consumer | 59 |
| Attorneys-Business Litigation | 60 |
| Attorneys-Civil Rights | 60 |
| Attorneys-Civil Trial Law | 60 |
| Attorneys-Collections | 60 |
| Attorneys-Construction Law | 60 |
| Attorneys-Corporation & Business Law | 60 |
| Attorneys-Criminal Appellate | 60 |
| Attorneys-Criminal Law | 60 |
| Attorneys-Disability Law | 60 |
| Attorneys-Driving Under The Influence Of Alcohol | 60 |
| & Drugs Law |