| Business | Phone |
| Capital Lighting & Supply Inc 260 Interstate Cir, Frederick 21704 | (301) 663-1232 |
| Central Electric Supply Ltd 7309 Grove Rd # B, Frederick 21704 | (301) 620-8703 |
| Hagemeyer 5805 Buckeystown Pike, Frederick 21704 | (301) 662-2136 |
| Rexel 1307 E Patrick St, Frederick 21701 | (301) 662-5952 |