| Business | Phone |
| Advance Micro Power Inc 2190 Smithtown Ave, Ronkonkoma 11779 | (631) 471-6157 |
| Amp Components 2190 Smithtown Ave, Ronkonkoma 11779 | (631) 471-5400 |
| Amphenol Sine Systems 16 Jamar Ln, Ronkonkoma 11779 | (631) 585-1238 |
| Apollo Display Technology Inc 85 Remington Blvd, Ronkonkoma 11779 | (631) 580-4360 |
| Jet City Productions 316 Deer Rd, Ronkonkoma 11779 | (631) 471-4821 |
| Kelly & Hayes Electrical Supply 49 Remington Blvd, Ronkonkoma 11779 | (631) 467-3939 |
| Scr Inc 76 Union Ave # B, Ronkonkoma 11779 | (631) 585-4411 |
| Specialty Microwave Corp 120 Raynor Ave, Ronkonkoma 11779 | (631) 737-1919 |
| Triangle Electronics Group Inc 1900 Ocean Ave, Ronkonkoma 11779 | (631) 585-1200 |
| Yankee Electrical Supply Co 1717 Ocean Ave, Ronkonkoma 11779 | (631) 588-9700 |