| Business | Phone |
| C D & M Electronics Inc 3081 Elm Point Industrial Dr, St Charles 63301 | (636) 947-7110 |
| Whiteside & Assoc 105 N Main St # 104, St Charles 63301 | (636) 947-4727 |
| Vector 50 Portwest Ct, St Charles 63303 | (636) 949-5925 |
| S C Electric Inc 2455 Raymond Dr, St Charles 63301 | (636) 947-4004 |
| Maxima Electrical Sales Co 607 1st Capitol Dr, St Charles 63301 | (636) 896-0990 |
| Lectronix Inc 540 Little Hills Industrial Bl, St Charles 63301 | (636) 946-6424 |
| L W Supply 215 Fox Hill Rd, St Charles 63301 | (636) 723-7160 |
| Gramlich Electrical Power 1604 Gettysburg Lndg, St Charles 63303 | (636) 928-1075 |
| Crosslink Electronics 1480 Woodstone Dr # 214, St Charles 63304 | (636) 477-9900 |