| Business | Phone |
| Alfred Benesch & Co 1550 Pond Rd # 201, Allentown 18104 | (610) 439-7066 |
| Barry Isett & Assoc 85 S Route 100, Allentown 18106 | (610) 398-0904 |
| Base Engineering Inc 1044 N Quebec St, Allentown 18109 | (610) 437-0978 |
| Benchmark Civil Engineering 1727 W Jonathan St, Allentown 18104 | (610) 776-6700 |
| Dme Alliance Inc 5012 Medical Center Cir, Allentown 18106 | (610) 366-1744 |
| Durant Enterprises Inc 512 W Hamilton St # 405, Allentown 18101 | (610) 437-1760 |
| Engineering Solutions Inc 5012 Medical Center Cir, Allentown 18106 | (610) 391-8290 |
| Gatter & Diehl 3015 College Heights Blvd #202, Allentown 18104 | (610) 740-1610 |
| H Wilden & Assoc Inc 7310 Tilghman St # 600, Allentown 18106 | (610) 871-3935 |
| Halide Group Inc 5050 W Tilghman St, Allentown 18104 | (610) 398-1400 |
| L B & W Engineering Inc 961 Marcon Blvd # 401, Allentown 18109 | (610) 264-8191 |
| Mc Tish Kunkel & Assoc 2402 Sunshine Rd, Allentown 18103 | (610) 791-2700 |
| Pany & Lentz Engineering Co 609 W Hamilton St # 3, Allentown 18101 | (610) 433-1634 |
| Site-Blauvelt Engineers 850 N 5th St # 5, Allentown 18102 | (610) 776-7483 |
| R W Manning Machine & Controls 361 W Gordon St, Allentown 18102 | (610) 439-0351 |