| Business | Phone |
| Ace-Pelizon Plumbing Inc Diamond Bar 91765 | (909) 860-1130 |
| Adams Electric 414 S Rock River Rd, Diamond Bar 91765 | (909) 861-0025 |
| Asplundh Tree Expert Co Diamond Bar 91765 | (909) 612-0441 |
| Young Service Electric & Ac 1080 Grand Ave # 16b, Diamond Bar 91765 | (909) 861-4768 |
| T P Electric 951 Silvertip Dr, Diamond Bar 91765 | (909) 860-9457 |
| Lewis Industrial Electric Diamond Bar 91765 | (909) 860-9544 |
| Post Electric Co 450 N Prospectors Rd, Diamond Bar 91765 | (909) 612-0345 |