| Business | Phone |
| Marocco Construction Co 1526 E Joppa Rd # 1, Baltimore 21286 | (410) 828-9033 |
| Lazzati Construction Co 1408 Shoemaker Rd, Baltimore 21209 | (410) 296-0433 |
| Northern Pipeline Construction 6310 Cove Ave, Baltimore 21226 | (410) 355-1083 |
| County Utilities Corp 21 Governors Ct, Baltimore 21244 | (410) 298-0061 |
| Utilx Corp 4701 Foster Ave, Baltimore 21224 | (410) 344-1915 |
| Ctg Inc 3922 Washington Blvd, Baltimore 21227 | (410) 525-1173 |