| Business | Phone |
| Accu Tech Manufacturer 33361 Croation Way, Union City 94587 | (510) 441-8399 |
| Advanced Products Labs Inc 30017 Ahern Ave, Union City 94587 | (510) 661-4241 |
| Dynatech Machining 29530 Kohoutek Way, Union City 94587 | (510) 441-0242 |
| Kovowerk 30550 Union City Blvd, Union City 94587 | (510) 881-5285 |
| L & E Custom Machining 33483 Western Ave, Union City 94587 | (510) 477-8979 |
| Marcu Manufacturing Inc 1290 Pacific St, Union City 94587 | (510) 324-8834 |
| Mostek's Machine Shop 33206 Western Ave, Union City 94587 | (510) 489-9312 |
| Ptr Manufacturer Inc 33390 Transit Ave, Union City 94587 | (510) 477-9654 |
| Quattro Manufacturing Co 33370 Dowe Ave, Union City 94587 | (510) 429-8282 |
| Global Contract Manufacturer 1350 Atlantic St, Union City 94587 | (510) 475-0404 |
| Tnt Precision Inc 33480 Western Ave, Union City 94587 | (510) 429-8088 |
| Trimetrics Specialities 30540 Union City Blvd # B, Union City 94587 | (510) 471-1632 |