| OWOmega Wire INC - Williamstown Ny Facility | Williamstown | NY | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| CPChevron Phillips Chemical CO LP | Williamstown | KY | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| DMDecora Mfg | Williamstown | NJ | Nonmetallic Mineral Product Manufacturing327213 | — | ◇ UNVERIFIED |
| GCGeneral Cable CO | Williamstown | MA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| GPGusher Pumps | Williamstown | KY | Machinery Manufacturing333911 | — | ◇ UNVERIFIED |
| HMHino Motors Manufacturing | Williamstown | WV | Transportation Equipment Manufacturing336120 | — | ◇ UNVERIFIED |
| HMHino Motors Manufacturing Usa, INC. | Williamstown | WV | Electrical Equipment, Appliance & Component Manufacturing335931 | — | ◇ UNVERIFIED |
| PIPhotex Imaging Systems | Williamstown | MA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| PGPiramal Glass USA | Williamstown | NJ | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| SSSouth State CO | Williamstown | NJ | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
 Sun Manufacturing | Williamstown | KY | Transportation Equipment Manufacturing336370 | — | ◇ UNVERIFIED |
| TCTe Connectivity CORP Williamstown Gwcu | Williamstown | PA | Computer and Electronic Product Manufacturing334417 | — | ◇ UNVERIFIED |
| WCWv Coaters | Williamstown | WV | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| 2V213 Ventures Corporation | Williamstown | MA | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| BCBancroft Custom Woodwork, INC. | Williamstown | MA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| CLCkbc LLC | Williamstown | NJ | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| JSJ S Machining, LLC | Williamstown | NJ | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| LHLawrence Hall Williams College | Williamstown | MA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| LFLewis Flying Service INC | Williamstown | NJ | Transportation Equipment Manufacturing336412 | — | ◇ UNVERIFIED |
| PLPinnacle Lightning Protection, LLC | Williamstown | MA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| PMPrecision Metalcrafters, INC. | Williamstown | NJ | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| PPProgressive Plastics, INC. | Williamstown | VT | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| RJRobert J Donaldson, INC. | Williamstown | NJ | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| ZTZemco Tool & Die | Williamstown | PA | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
