| 3599 | Animal-drawn vehicles and parts, manufacturing | |
| 0150 | Animals, fur-bearing, hunting, trapping and skinning | |
| 5239 | Animals, pet, retail | |
| 5121 | Animals, pet, wholesale | |
| 6023 | Animals, truck transport | |
| 9214 | Animated cartoon artists, independent | |
| 9211 | Animated cartoons production | |
| 9211 | Animated film production | |
| 9211 | Animated film production and distribution | |
| 2429 | Anise oil, manufacturing | |
| 3311 | Ankle supports, orthopedic, manufacturing | |
| 1730 | Anklets, hosiery or socks, knitting | |
| 2411 | Annato extract, manufacturing | |
| 2923 | Annealing vats, manufacturing | |
| 9214 | Announcers, radio and television, independent | |
| 6601 | Annuities, life insurance companies | |
| 2913 | Annular ball bearings, manufacturing | |
| 3130 | Annunciator wire and cable, insulated, manufacturing | |
| 3313 | Annunciators, relay and solid state types, industrial display, manufacturing | |
| 5142 | Anode metal, wholesale | |
| 2720 | Anodes, for electrolytic refining, copper, manufacturing | |
| 2720 | Anodes, for electroplating, copper, made from purchased metals | |
| 2720 | Anodes, for electroplating, non-ferrous metals (except aluminum, copper), made from purchased metals | |
| 2720 | Anodes, for electroplating, precious metals, made from purchased metals | |
| 2929 | Anodizing equipment, manufacturing | |
| 2892 | Anodizing metals and metal products, for the trade | |
| 5139 | Answering machines, telephone, wholesale | |
| 7499 | Answering services, telephone | |
| 2421 | Ant poisons, manufacturing | |
| 2423 | Antacid preparations, manufacturing | |
| 5139 | Antacid preparations, wholesale | |
| 5233 | Antenna stores, household, retail | |
| 4520 | Antennas (towers), construction | |
| 4530 | Antennas, household, installation and service | |
| 3230 | Antennas, receiving, manufacturing | |
| 4530 | Antennas, residential, installation | |
| 3230 | Antennas, satellite, manufacturing | |
| 3220 | Antennas, transmitting and communications, manufacturing | |
| 2423 | Anthelmintic preparations, manufacturing | |
| 2411 | Anthracene, manufacturing | |