| 6302 | Warehousing, whisky | |
| 3312 | Warfare countermeasures equipment, manufacturing | |
| 5143 | Warm air heating and cooling equipment, wholesale | |
| 5143 | Warm air heating equipment, non-electric, wholesale | |
| 4530 | Warm air heating systems, installation | |
| 1810 | Warm-up suits, girls', cut and sewn from purchased fabric | |
| 1730 | Warm-up suits, made in knitting mills | |
| 1810 | Warm-up suits, men's and boys', cut and sewn from purchased fabric | |
| 1810 | Warm-up suits, women's and misses', cut and sewn from purchased fabric | |
| 1730 | Warp fabric knitting | |
| 5131 | Warp knit fabrics, wholesale | |
| 2926 | Warping machinery, manufacturing | |
| 6603 | Warranty insurance, automobile | |
| 6603 | Warranty insurance, home | |
| 1810 | Washable service apparel (e.g., barbers', hospital, professional), men's and boys', cut and sewn from purchased fabric | |
| 1810 | Washable service apparel (e.g., maids', nurses', waitresses'), women's, misses' and girls', cut and sewn from purchased fabric | |
| 1810 | Washable service apparel, men's and boys', cut and sewn from materials owned by others | |
| 1810 | Washable service apparel, women's, misses' and girls', cut and sewn from materials owned by others | |
| 2029 | Washboards, wood and part wood, manufacturing | |
| 1721 | Washcloths, made from purchased fabrics | |
| 4520 | Washeries construction, mining, general contractors | |
| 1010 | Washeries, anthracite | |
| 1010 | Washeries, bituminous coal | |
| 7130 | Washers and dryers, rental | |
| 2519 | Washers and gaskets, rubber, manufacturing | |
| 2924 | Washers, aggregate and sand, stationary, manufacturing | |
| 5143 | Washers, hardware, wholesale | |
| 1912 | Washers, leather, manufacturing | |
| 2899 | Washers, metal, manufacturing | |
| 2899 | Washers, stamped metal, manufacturing | |
| 9301 | Washerwomen, own account | |
| 5139 | Washing compounds, industrial, wholesale | |
| 2930 | Washing machines, domestic, manufacturing | |
| 5139 | Washing machines, electric, domestic, wholesale | |
| 2930 | Washing machines, household (including coin-operated), manufacturing | |
| 5233 | Washing machines, household, retail | |
| 2926 | Washing machines, laundry (except household type), manufacturing | |
| 5020 | Washing service, motor vehicle | |
| 7493 | Washroom sanitation service | |
| 5149 | Waste bottles and boxes, wholesale | |