| Business | Phone |
| Atlantic Electric Supply Corp 3726 10th St Ne, Washington 20017 | (202) 526-1300 |
| D-M-E Co 408 4th St Sw, Washington 20024 | (202) 488-7766 |
| Dominion Electric Supply Co 22 K St Ne, Washington 20002 | (202) 789-0500 |
| International Brotherhood 525 New Jersey Ave Nw, Washington 20001 | (202) 347-1275 |
| Maurice Electrical Supply Co 500 Penn St Ne, Washington 20002 | (202) 675-9400 |
| Meridian Electrical Co 5219 Georgia Ave Nw, Washington 20011 | (202) 726-6513 |
| Samsung Electronics America 1200 New Hampshire Ave Nw #550, Washington 20036 | (202) 296-0227 |
| Shiva Electronics 2438 18th St Nw, Washington 20009 | (202) 387-8400 |
| Southern Utilities Co Inc 1126 9th St Nw, Washington 20001 | (202) 289-1141 |