| 7512 | Adult education, program, local | |
| 7430 | Advertising agencies | |
| 7430 | Advertising consultants (agencies) | |
| 2221 | Advertising displays (except printed), manufacturing | |
| 7499 | Advertising mailing services (i.e., preparing advertising material, such as coupons, flyers or samples, for mailing or other direct distribution) | |
| 7430 | Advertising material (e.g., circulars, samples), direct distribution services | |
| 2221 | Advertising material (e.g., coupons, flyers), printing without publishing | |
| 7430 | Advertising media representatives, offices of | |
| 2212 | Advertising periodicals, publisher | |
| 2212 | Advertising periodicals, publishing | |
| 2212 | Advertising periodicals, publishing and printing | |
| 7430 | Advertising representatives, media, independent | |
| 7430 | Advertising representatives, television or radio, independent | |
| 7430 | Advertising representatives, television or radio, offices of | |
| 7430 | Advertising services | |
| 7430 | Advertising services, indoor or outdoor display | |
| 3699 | Advertising specialties, manufacturing | |
| 5139 | Advertising specialties, wholesale | |
| 7430 | Advertising specialty distribution services (creating and organizing the production of specialty advertising products) | |
| 7511 | Advisory commissions, executive | |
| 7511 | Advisory commissions, legislative | |
| 9199 | Advocacy groups | |
| 6021 | Aerial cable cars, sightseeing | |
| 3320 | Aerial cameras, manufacturing | |
| 0140 | Aerial crop dusting service | |
| 0140 | Aerial crop spraying service | |
| 7421 | Aerial geophysical surveying and mapping | |
| 7499 | Aerial inspection service, pipelines | |
| 7421 | Aerial map making, using specialized equipment | |
| 4550 | Aerial or picker truck, rental with operator | |
| 7494 | Aerial photography services (i.e., photographers specializing in aerial photography, except map making) | |
| 6220 | Aerial service to construction | |
| 7421 | Aerial surveying (except geophysical), using specialized equipment | |
| 6021 | Aerial tramways, sightseeing or scenic | |
| 0200 | Aerial water bombing service | |
| 2915 | Aerial work platforms, manufacturing | |
| 9241 | Aerobic dance centres | |
| 9241 | Aerobic dance instructors, independent | |
| 5150 | Aeronautical and aircraft equipment (except electronic), wholesale | |
| 7421 | Aeronautical design services | |