| Business | Phone |
| Hart Engineering Co Inc 109 W Hoyt Dr, Longview 75601 | (903) 758-0166 |
| Canfield Engineering Inc 303 Ramblewood Pl, Longview 75605 | (903) 757-6466 |
| Winn Engineering & Constr Pllc 211 E Tyler St # 420, Longview 75601 | (903) 553-0500 |
| R & J Engineering Inc 220 Progress Blvd, Longview 75604 | (903) 297-4343 |