| MOMizuho Orthopedic Systems, Inc. (Mizuho OSI) | Union City | CA | Miscellaneous Manufacturing339113 | 500+ | ◐ LIKELY ACTIVE |
| MFMolded Fiber Glass | Union City | PA | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| MUMPP Union City | Union City | CA | Paper Manufacturing322211 | 20-99 | ◐ LIKELY ACTIVE |
| NFNicolosi Foods Inc. | Union City | NJ | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
Otu Medical INC | Union City | CA | Miscellaneous Manufacturing339112 | — | ◐ LIKELY ACTIVE |
| PCParker-hannifin Corporation | Union City | PA | Fabricated Metal Product Manufacturing332912 | — | ◐ LIKELY ACTIVE |
| P3Planet 3 Machining Solutions LLC | Union City | TN | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| PCPS California Union City 1765 Atlantic Street | Union City | CA | Nonmetallic Mineral Product Manufacturing327991 | 1-19 | ◐ LIKELY ACTIVE |
| SSfodip | Union City | CA | Nonmetallic Mineral Product Manufacturing327332 | 100-499 | ◐ LIKELY ACTIVE |
| SCSouthern Concrete Products of Union City | Union City | TN | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◐ LIKELY ACTIVE |
| SMSouthern Mills, INC | Union City | GA | Textile Mills313210 | — | ◐ LIKELY ACTIVE |
| STSunpower Technology CORP. | Union City | CA | Computer and Electronic Product Manufacturing334111 | — | ◐ LIKELY ACTIVE |
Systomatic | Union City | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| UCUnion City Foundry | Union City | OH | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| UCUnion City Shower Doors | Union City | TN | Nonmetallic Mineral Product Manufacturing327215 | 100-499 | ◐ LIKELY ACTIVE |
| UFUniversal Forest Products Union City LLC | Union City | GA | Wood Product Manufacturing321114 | 100-499 | ◐ LIKELY ACTIVE |
| WMWorkhorse Manufacturing Plant | Union City | IN | Transportation Equipment Manufacturing336111 | 20-99 | ◐ LIKELY ACTIVE |
| ZAZoetis (Formerly Abaxis) | Union City | CA | Computer and Electronic Product Manufacturing334510 | 100-499 | ◐ LIKELY ACTIVE |