| 4520 | Scaffolds, erecting and dismantling | |
| 2811 | Scaffolds, metal, manufacturing | |
| 2919 | Scale, non-electronic, repair | |
| 3000 | Scalers, for gummed tape, hand, manufacturing | |
| 3312 | Scalers, nuclear radiation, manufacturing | |
| 2919 | Scales (except laboratory), manufacturing | |
| 3312 | Scales, apothecary, manufacturing | |
| 3312 | Scales, chemical, manufacturing | |
| 9309 | Scales, coin-operated, operation of | |
| 2919 | Scales, electronic, repairing | |
| 3312 | Scales, scientific, manufacturing | |
| 5150 | Scales, wholesale | |
| 1810 | Scalloping of clothing owned by others | |
| 5122 | Scallops, fresh or frozen (except frozen packaged), wholesale | |
| 9309 | Scalp treating service | |
| 9309 | Scalp treatment service | |
| 3000 | Scanners, computer peripheral equipment, manufacturing | |
| 2922 | Scarfing machines, woodworking type, manufacturing | |
| 2923 | Scarfing units, rolling mill machinery, manufacturing | |
| 2924 | Scarifiers, road, manufacturing | |
| 2411 | Scarlet 2 R lake, manufacturing | |
| 5131 | Scarves and neckwear, women's, misses' and children's, wholesale | |
| 1810 | Scarves, made from purchased fabric | |
| 1730 | Scarves, made in knitting mills | |
| 1810 | Scarves, men's and boys', made from purchased fabric | |
| 5131 | Scarves, men's and boys', wholesale | |
| 5131 | Scarves, women's, children's and infant's, wholesale | |
| 1810 | Scarves, women's, misses' and girls', made from purchased fabric | |
| 3430 | Scattershield, engine, manufacturing | |
| 5149 | Scavengering, wholesale | |
| 9214 | Scenery designers, theatrical, independent | |
| 3699 | Scenery for theatres, opera houses, halls and schools, manufacturing | |
| 7130 | Scenery theatrical, rental | |
| 3699 | Scenery, theatrical, manufacturing | |
| 6021 | Scenic and sightseeing bus transportation, local | |
| 6021 | Scenic railroad, operation, local | |
| 2221 | Schedules (e.g., radio, television, transportation), printing without publishing | |
| 1320 | Scheelite mining | |
| 1320 | Scheelite ore mining | |
| 1729 | Schiffli machine embroideries, manufacturing | |