| Business | Phone |
| Arch Engineering Co 121 South Dr, Pittsburgh 15238 | (412) 967-9778 |
| Ats Chester Engineers 225 Ross St # 5, Pittsburgh 15219 | (412) 281-0206 |
| Autoclave Engineers Inc 1350 Old Freeport Rd, Pittsburgh 15238 | (412) 967-0117 |
| Avatar Broadband Engineering 4955 Steubenville Pike # 260, Pittsburgh 15205 | (412) 494-9901 |
| Bergmann Associates 7 Parkway Ctr, Pittsburgh 15220 | (412) 928-1790 |
| Building Technology Engineers 416 7th Ave, Pittsburgh 15219 | (412) 201-0160 |
| John E Campbell 8347 Ohio River Blvd, Pittsburgh 15202 | (412) 761-3511 |
| Esoc 357 N Craig St, Pittsburgh 15213 | (412) 683-0502 |
| Ewie Co Inc 230 Alpha Dr, Pittsburgh 15238 | (412) 963-7460 |
| Forefront Engineering & Design 400 Penn Center Blvd, Pittsburgh 15235 | (412) 824-7998 |
| Garvin Boward Engineering Inc 180 Bilmar Dr, Pittsburgh 15205 | (412) 922-4440 |
| Gilson Engineering 535 Rochester Rd, Pittsburgh 15237 | (412) 369-0100 |
| Global Registrars Inc 4700 Clairton Blvd # 2, Pittsburgh 15236 | (412) 884-2290 |
| H2m1 Engineering 800 Vinial St, Pittsburgh 15212 | (412) 321-1822 |
| Harris Percision Engineering 444 Liberty Ave, Pittsburgh 15222 | (412) 642-0752 |
| Integrated Sales & Engineering 736 W Ingomar Rd, Pittsburgh 15237 | (412) 366-5065 |
| John J Mc Mullen & Assoc Inc 1789 S Braddock Ave # 400, Pittsburgh 15218 | (412) 473-6100 |
| Michael Baker Corp 650 Smithfield St, Pittsburgh 15222 | (412) 395-0680 |
| Monaloh Basin Engineers Inc 300 Business Center Dr, Pittsburgh 15205 | (412) 788-2433 |
| National Signal Technology 875 William Pitt Way, Pittsburgh 15238 | (412) 826-3420 |
| O'Donnell Consulting Engineers 501 Grant St # 301, Pittsburgh 15219 | (412) 577-2977 |
| Olsen Engineering 9707 Frankstown Rd, Pittsburgh 15235 | (412) 242-2725 |
| Parsons Corp 1 Greenway Dr # 13e, Pittsburgh 15204 | (412) 645-4541 |
| Reich Hh Engineers 2500 Baldwick Rd, Pittsburgh 15205 | (412) 928-3232 |
| Remediation Technologies Inc 3040 William Pitt Way, Pittsburgh 15238 | (412) 826-3340 |
| Richard Kotler Inc 10 Bevington Rd, Pittsburgh 15221 | (412) 371-5073 |
| Ritter Engineering Co 1952 Painters Run Rd, Pittsburgh 15241 | (412) 221-1776 |
| Roach & Assoc Inc 615 Washington Rd # 404, Pittsburgh 15228 | (412) 344-9310 |
| S D Engineers Inc 2425 Liberty Ave, Pittsburgh 15222 | (412) 562-7502 |
| Supt Of Engineering 4166 2nd Ave, Pittsburgh 15207 | (412) 227-4967 |
| Weidmann Technical Svc Inc 1580 Mclaughlin Run Rd, Pittsburgh 15241 | (412) 257-3778 |
| Quad Three Group Inc 3445 Butler St, Pittsburgh 15201 | (412) 781-1344 |