| national commercial banks | national security | nature center |
| needles | new car dealers | new dealers |
| newspaper | newspaper distributors | newspaper publishers |
| news service | newsstand | news syndicates |
| no drivers | non | nonclassified establishments |
| nonclay refractories | non ferrous foundry | nonferrous insulating |
| nonferrous wiredrawing | nonmetallic mineral products | non profit organizations |
| nonresidential building operators | nonscheduled | novelties-ex prcs manufacturers |
| novelties ex prcs | novelty shops | nurserymen's equipment |
| nurserymen's supplies | nurserymen equipment manufacturers | nurserymen supplies manufacturers |
| nursery schools | nursing care | nursing convalescent homes |
| nursing home | nuts manufacturers |
