| Business | Phone |
| B & C Glass Block 517 Springdale Dr, Pittsburgh 15235 | (412) 795-8890 |
| John's Glass Block 171 Bunny Way, Pittsburgh 15237 | (412) 931-0697 |
| Pittsburgh Corning Corp 800 Presque Isle Dr, Pittsburgh 15239 | (724) 327-6100 |
| Plum Glass Block Co 4783 Havana Dr, Pittsburgh 15239 | (412) 795-3588 |
| Premiere Glass Block 610 Elaine Dr, Pittsburgh 15236 | (412) 835-8011 |