| DTDakota Tube Building 3 | Watertown | SD | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| DTDakota Tube INC | Watertown | SD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| FSFiberglass Specialties INC | Watertown | SD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SESmith Equipment Manufacturing | Watertown | SD | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
 Twin City Die Castings CO - Watertown Div | Watertown | SD | Primary Metal Manufacturing331522 | — | ◇ UNVERIFIED |
| BPB&g Powder Coating LLC | Watertown | SD | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| CDConcrete Dakota Redi Mix INC. | Watertown | SD | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| CFCustom Fabricators INC. | Watertown | SD | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| EMEsco Manufacturing, INC. | Watertown | SD | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| GGcc-watertown | Watertown | SD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MLMetrix, LLC | Watertown | SD | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MIMidcom INC | Watertown | SD | Computer and Electronic Product Manufacturing334416 | — | ◇ UNVERIFIED |
| MRMinnesota Rubber & Plastics | Watertown | SD | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| TSTerex South Dakota | Watertown | SD | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| TSTerex South Dakota - Main Plant | Watertown | SD | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| ATAero Trailers LLC | Watertown | SD | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
 B&g Industries, INC. | Watertown | SD | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| FDFormer Dakota Bodies, INC. | Watertown | SD | Fabricated Metal Product Manufacturing332111 | — | ◇ UNVERIFIED |
| GPG&J Properties LLC | Watertown | SD | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| HCHub City Energy | Watertown | SD | Chemical Manufacturing325193 | — | ◇ 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 |
