| WAWelding Accessories and Cutting - Watertown | Watertown, SD | Machinery Manufacturing333992 | 20–99 | ◐ LIKELY ACTIVE |
| WEWurth Electronics Midcom Inc. | Watertown, SD | Computer and Electronic Product Manufacturing334416 | 100–499 | ◐ LIKELY ACTIVE |
| ATAero Trailers LLC | Watertown, SD | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
 B&g Industries, INC. | Watertown, SD | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| EPEmberline Press, Inc. | Watertown, SD | — | — | ◇ UNVERIFIED |
| FDFormer Dakota Bodies, INC. | Watertown, SD | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| GPG&J Properties LLC | Watertown, SD | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| IDInformational Data Technologies LLC | Watertown, SD | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| KRK&p Reynolds LLC | Watertown, SD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| MWMacksteel Warehouse, INC. | Watertown, SD | Machinery Manufacturing333111 | — | ◇ UNVERIFIED |
| MUMidcom Unit Midtex Division (former Location) | Watertown, SD | Computer and Electronic Product Manufacturing334419 | — | ◇ UNVERIFIED |
| RMRay Manufacturing LLC | Watertown, SD | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| WHWmmpa Hubbard Feed Mill and Adjoining Property | Watertown, SD | Food Manufacturing311119 | — | ◇ UNVERIFIED |
