| Business | Phone |
| Hlw Electric 9307 Old Marlboro Pike, Upper Marlboro 20772 | (301) 599-0100 |
| John E Kelly & Sons Electrical 8431 Old Marlboro Pike # 201, Upper Marlboro 20772 | (301) 736-2250 |
| Kelly Hvac 8421 Westphalia Rd, Upper Marlboro 20774 | (301) 736-6585 |
| Ledbetter Electrical Co Upper Marlboro 20772 | (301) 574-3456 |
| Merical Electrical Contractors 6411 Crain Hwy, Upper Marlboro 20772 | (301) 952-9100 |
| Munn & Munn Elec Ent Inc 907 Manor House Dr, Upper Marlboro 20774 | (301) 249-7461 |
| Nation Wide Properties Upper Marlboro 20774 | (301) 333-0222 |
| Paul J Vignola Electric Co 9007 Dower House Rd W, Upper Marlboro 20772 | (301) 599-5995 |
| Power Services Inc 16000 Trade Zone Ave # 105, Upper Marlboro 20774 | (301) 390-0800 |
| Powerhouse Electrical 17815 Claggett Landing Rd, Upper Marlboro 20774 | (301) 249-2049 |
| Powerhouse Electrical 9672 Pennsylvania Ave, Upper Marlboro 20772 | (301) 599-5909 |
| Rew Group 9105 Old Marlboro Pike, Upper Marlboro 20772 | (301) 599-5500 |
| Rich Electric Co 203 Graiden St, Upper Marlboro 20774 | (301) 249-1394 |
| Royal Electric Inc 653 Commerce Dr, Upper Marlboro 20774 | (301) 249-4972 |
| Bowman Electric Upper Marlboro 20772 | (301) 808-0596 |
| C G Electric Inc 8329 Old Marlboro Pike # B5, Upper Marlboro 20772 | (301) 735-8200 |
| Carter Brothers Electrical Inc 6423 Crain Hwy, Upper Marlboro 20772 | (301) 627-4142 |
| Terry Electrical Svc 9601 Lockerby Ct, Upper Marlboro 20772 | (240) 318-0330 |
| Three Phaze Electrical Co 4712 Captain Bayne Ct, Upper Marlboro 20772 | (301) 773-8660 |
| Total Electric Svc 16000 Trade Zone Ave # 303, Upper Marlboro 20774 | (301) 390-4800 |
| Chuck's Electrical Svc 12446 Old Colony Dr, Upper Marlboro 20772 | (301) 780-9394 |
| Critical Mission Electric 9913 Brookhaven Ln, Upper Marlboro 20772 | (301) 780-7332 |
| Tunnel Electric Construction 8043 Penn Randall Pl, Upper Marlboro 20772 | (301) 736-3225 |
| Delta Electrical Construction 623 Commerce Dr, Upper Marlboro 20774 | (301) 249-0066 |
| Electrical Connection Inc 12700 Duley Station Rd, Upper Marlboro 20772 | (301) 627-8351 |
| F & M Electrical Svc 9405 Concord Dr, Upper Marlboro 20772 | (301) 599-7776 |
| Hall's Electric 9708 Marlboro Pike, Upper Marlboro 20772 | (301) 599-6932 |
| Hara Electrical Contr 9311 Old Marlboro Pike, Upper Marlboro 20772 | (301) 856-0292 |