| 2922 | Jig saws, hand held power driven, manufacturing | |
| 2922 | Jig saws, woodworking type, stationary, manufacturing | |
| 0500 | Jigging (fishing), salt water | |
| 2922 | Jigs (e.g., inspection, gauging, checking), manufacturing | |
| 2922 | Jigs and fixtures, for use with machine tools, manufacturing | |
| 5150 | Jigs, wholesale | |
| 2221 | Job printing, flexographic | |
| 2221 | Job printing, gravure | |
| 2221 | Job printing, letterpress | |
| 2221 | Job printing, lithographic (except quick) | |
| 2221 | Job printing, offset (except quick) | |
| 1810 | Jobbers, men's and boys' clothing | |
| 9241 | Jockeys, horse racing | |
| 3693 | Jogging machines, manufacturing | |
| 1810 | Jogging suits, girls', cut and sewn from purchased fabric | |
| 1730 | Jogging suits, made in knitting mills | |
| 1810 | Jogging suits, men's and boys', cut and sewn from purchased fabric | |
| 1810 | Jogging suits, women's and misses', cut and sewn from purchased fabric | |
| 1810 | Jogging suits, women's, misses' and girls', cut and sewn from purchased fabric | |
| 4540 | Joinery, ship, contractors | |
| 2422 | Joint compounds (except gypsum-based), manufacturing | |
| 2695 | Joint compounds, gypsum-based, manufacturing | |
| 2922 | Jointers, woodworking, manufacturing | |
| 2913 | Joints, swivel (except motor vehicle and aircraft), manufacturing | |
| 2913 | Joints, universal (except motor vehicle and aircraft), manufacturing | |
| 3530 | Joints, universal, aircraft, manufacturing | |
| 3430 | Joints, universal, automotive, truck and bus, manufacturing | |
| 2811 | Joists, fabricated bar, manufacturing | |
| 2695 | Joists, girders and beams, prestressed concrete, manufacturing | |
| 2811 | Joists, open web steel, long-span series, manufacturing | |
| 2811 | Joists, sheet metal, manufacturing | |
| 5239 | Joke shops | |
| 9220 | Journalists, independent | |
| 2221 | Journals and magazines, trade, printing without publishing | |
| 2221 | Journals, scholarly, printing without publishing | |
| 3000 | Joystick devices, manufacturing | |
| 7523 | Judge, self-employed | |
| 9241 | Judo and jiu jitsu instruction | |
| 2520 | Jugs, vacuum, foam plastics (except polystyrene), manufacturing | |
| 3699 | Jugs, vacuum, light gauge metal, manufacturing | |