| 1410 | Sandstone crushing, on contract | |
| 1410 | Sandstone mining | |
| 1410 | Sandstone quarry | |
| 1429 | Sandstone, bituminous, quarrying | |
| 1410 | Sandstone, building stone, rough, mining | |
| 1410 | Sandstone, dimensional stone, rough, mining | |
| 1410 | Sandstone, dimension-quarrying | |
| 1410 | Sandstone, monumental and ornamental stone, rough, mining | |
| 5520 | Sandwich bar or shop | |
| 5520 | Sandwich shop | |
| 1549 | Sandwich spreads (except salad dressing-based), manufacturing | |
| 1511 | Sandwich spreads, meat, made from purchased meat | |
| 2930 | Sandwich toasters and grills, household, electric, manufacturing | |
| 1549 | Sandwiches, fresh (i.e., assembled and packaged for the wholesale market), manufacturing | |
| 5122 | Sandwiches, wholesale | |
| 1712 | Sanforizing fabrics, for the trade | |
| 1810 | Sanitary aprons, manufacturing | |
| 7512 | Sanitary districts-nonoperating | |
| 7512 | Sanitary engineering agencies, government | |
| 5139 | Sanitary food containers (e.g., paper, paperboard, disposable plastics), wholesale | |
| 2102 | Sanitary food containers (except folding), made from purchased paper or paperboard | |
| 2102 | Sanitary food containers, folding, made from purchased paperboard | |
| 9000 | Sanitary landfill operation | |
| 2109 | Sanitary napkins and tampons, made from purchased paper | |
| 2101 | Sanitary napkins and tampons, made in paper mills | |
| 1729 | Sanitary napkins and tampons, textile wadding, manufacturing | |
| 2101 | Sanitary paper products, made in paper mills | |
| 5149 | Sanitary paper products, wholesale | |
| 2101 | Sanitary paper stock (e.g., for making towels, serviettes, tampons), manufacturing | |
| 2109 | Sanitary products, made from purchased sanitary paper stock | |
| 5139 | Sanitary products, personal, wholesale | |
| 4520 | Sanitary sewers, construction | |
| 4520 | Sanitary trunk and collector lines, construction | |
| 2899 | Sanitary ware (e.g., bathtubs, lavoratories, sinks), metal, manufacturing | |
| 4530 | Sanitary ware, installation | |
| 2691 | Sanitary ware, vitreous china, manufacturing | |
| 5143 | Sanitary ware, wholesale | |
| 7421 | Sanitation consulting services | |
| 5149 | Sanitation preparations, wholesale | |
| 4520 | Sanitation system construction | |