| Business | Phone |
| A Action Electric Rockville 20850 | (301) 762-1144 |
| A C Electric Co 15829 Redland Rd, Rockville 20855 | (301) 590-7300 |
| Allen & Whalen Co Inc Of Md 647 Lofstrand Ln # N, Rockville 20850 | (301) 762-5333 |
| W K Trunnell Inc 15754 Crabbs Branch Way, Rockville 20855 | (301) 258-8300 |
| Washington Electric Svc Co Inc 1107 Nelson St, Rockville 20850 | (301) 762-4243 |
| Arko Electrical Contr 12342 Wilkins Ave, Rockville 20852 | (301) 881-5711 |
| T A Beach Corp 12331 Carroll Ave, Rockville 20852 | (301) 770-2060 |
| Tievy Electric Co 742 E Gude Dr, Rockville 20850 | (301) 279-7233 |
| C & C Electric Co 2273 Lewis Ave, Rockville 20851 | (301) 770-3128 |
| Circle Electric Inc 12348 Wilkins Ave, Rockville 20852 | (301) 468-9473 |
| Circuit Electric 2255 Lewis Ave, Rockville 20851 | (301) 816-0178 |
| Cornwell Electric Inc 16416 Kipling Rd, Rockville 20855 | (301) 948-4026 |
| Reb Electrical Svc Rockville 20850 | (301) 251-2398 |
| Power Systems Electric Corp 603 Dover Rd # 1, Rockville 20850 | (301) 279-6777 |
| Premier Electric Rockville 20850 | (301) 738-3884 |
| Pel-Bern Electric Inc 640 Lofstrand Ln, Rockville 20850 | (301) 340-1040 |
| Electric Advantage Inc 1084 Taft St, Rockville 20850 | (301) 424-9588 |
| F B Harding & Inc 405 E Gude Dr # 12, Rockville 20850 | (301) 315-0900 |
| G & R Electric Co 5530 Wilkins Ct, Rockville 20852 | (301) 770-0081 |
| Galaxy Electric Ltd Rockville 20850 | (301) 340-9711 |
| M R Electricians 14012 Parkvale Rd, Rockville 20853 | (301) 315-9553 |
| Hyh Electric Co Inc 14640 Southlawn Ln # D, Rockville 20850 | (301) 762-5690 |
| Kirby Electric Of Rockville 909 Grandin Ave, Rockville 20851 | (301) 315-2195 |
| Kolb Electric 14672 Southlawn Ln # 4, Rockville 20850 | (301) 279-2133 |
| J S Paper Electric Inc 11600 Nebel St, Rockville 20852 | (301) 984-0305 |
| Jkj Electric Inc 638 Lofstrand Ln, Rockville 20850 | (301) 460-1492 |
| Kensco Service Rockville 20850 | (301) 762-9295 |