| 2520 | Jugs, vacuum, polystyrene foam, manufacturing | |
| 2925 | Juice extractors, fruit and vegetable (i.e., food manufacturing type), manufacturing | |
| 1520 | Juice pops, frozen, manufacturing | |
| 1513 | Juice, fruit or vegetable concentrates, frozen, manufacturing | |
| 1513 | Juice, fruit or vegetable, canned, manufacturing | |
| 1513 | Juice, fruit or vegetable, fresh, manufacturing | |
| 2930 | Juicers, electric, domestic, manufacturing | |
| 5122 | Juices, quick-frozen, packaged, wholesale | |
| 9249 | Juke box concession operators, in facilities operated by others | |
| 3230 | Jukeboxes, manufacturing | |
| 1810 | Jumpsuits, girls', cut and sewn from purchased fabric | |
| 1810 | Jumpsuits, women's and misses', cut and sewn from purchased fabric | |
| 3120 | Junction boxes and covers, electrical, manufacturing | |
| 9111 | Junior Chambers of Commerce | |
| 8030 | Junior colleges | |
| 5122 | Junior foods, canned, wholesale | |
| 5149 | Junk and scrap, general line, wholesale | |
| 5149 | Junk dealers, wholesale | |
| 1711 | Jute bags, made in broad-woven mills | |
| 1711 | Jute fabrics, broad-woven, weaving | |
| 5131 | Jute fabrics, piece goods, wholesale | |
| 1729 | Jute felt goods, nonwoven, manufacturing | |
| 5131 | Jute piece goods, woven, wholesale | |
| 1711 | Jute spinning | |
| 1711 | Jute spinning and weaving mill | |
| 8531 | Juvenile correctional homes | |
| 7523 | Juvenile courts | |
| 3610 | Juvenile furniture, manufacturing | |
| 3610 | Juvenile furniture, metal, manufacturing | |
| 3610 | Juvenile furniture, rattan and reed, manufacturing | |
| 3610 | Juvenile furniture, upholstered on wood frames (except convertible beds), manufacturing | |
| 3610 | Juvenile furniture, wood (except upholstered), manufacturing | |
| 2212 | Juvenile magazines and periodicals, publisher | |
| 2212 | Juvenile magazines and periodicals, publishing | |
| 2212 | Juvenile magazines and periodicals, publishing and printing combined | |