| Business | Phone |
| Benchmrk Civil Engineer Svc 1727 W Jonathan St, Allentown 18104 | (610) 437-2226 |
| Demuro Associates Inc 1011 Brookside Rd # 290, Allentown 18106 | (610) 481-9433 |
| Gilmore & Assoc 5100 W Tilghman St # 150, Allentown 18104 | (610) 366-8064 |
| Hanover Engineering Assoc Inc 5920 Hamilton Blvd # 108, Allentown 18106 | (610) 395-9222 |
| Jena Engineering Corp 2358 Sunshine Rd # 200, Allentown 18103 | (610) 797-4200 |
| Keystone Consulting Engineers 6235 Hamilton Blvd # 100, Allentown 18106 | (610) 395-0971 |
| Lehigh Valley Engineering Inc 622 N West St, Allentown 18102 | (610) 767-8545 |
| Liberty Engineering 7535 Windsor Dr # B102, Allentown 18195 | (484) 223-1761 |
| Mace Consulting Engineers 1501 N Cedar Crest Blvd, Allentown 18104 | (610) 432-1700 |
| Martin H Schuler Co 1143 W Walnut St, Allentown 18102 | (610) 433-5201 |
| Newton Engineering Group 6235 Hamilton Blvd # 212, Allentown 18106 | (610) 366-0060 |
| Pidcock Co 2451 Parkwood Dr, Allentown 18103 | (610) 791-2252 |