| Business | Phone |
| Arlon Electronics Substrates 9433 Hyssop Dr, Rancho Cucamonga 91730 | (909) 987-9533 |
| Celco Pacific Div 8660 Red Oak Ave, Rancho Cucamonga 91730 | (909) 481-4648 |
| Mercury United Electronics Inc 10823 Edison Ct, Rancho Cucamonga 91730 | (909) 466-0427 |
| Microtech Solutions Group 8753 Industrial Ln, Rancho Cucamonga 91730 | (909) 286-6516 |
| Emrise Electronics Corp 9654 Hermosa Ave, Rancho Cucamonga 91730 | (909) 987-9220 |
| Magnon Engineering Inc 8739 Lion St, Rancho Cucamonga 91730 | (909) 466-0199 |