| Business | Phone |
| Mark Electronics Supply Inc 11215 Old Baltimore Pike, Beltsville 20705 | (301) 595-5040 |
| Pioneer Electric Supply Co 12200 Old Baltimore Pike, Beltsville 20705 | (301) 419-0020 |
| United Electric Supply Co Inc 11712 Baltimore Ave, Beltsville 20705 | (301) 340-1630 |