| Business | Phone |
| Caci Inc 1 Poston Rd # 105, Charleston 29407 | (843) 766-4437 |
| Carolina Design Pc 451 Jessen Ln # A, Charleston 29492 | (843) 884-0625 |
| Charleston Engineering 125 Wappoo Creek Dr # 125b, Charleston 29412 | (843) 762-4242 |
| Collins Engineers Inc 125 Wappoo Creek Dr # G, Charleston 29412 | (843) 406-1300 |
| Dunaway Fletcher & Moore 8 Cumberland St, Charleston 29401 | (843) 722-4844 |
| Empire Engineering 1812 Savannah Hwy # A, Charleston 29407 | (843) 588-9440 |
| Engineering Services Inc 1753 Afton Ave, Charleston 29407 | (843) 766-8772 |
| General Engineering Llc 2040 Savage Rd, Charleston 29407 | (843) 769-7378 |
| Green Stripe 22 Limehouse St, Charleston 29401 | (843) 722-9076 |
| Lpa Group Inc 215 E Bay St # 505, Charleston 29401 | (843) 853-7786 |
| Malcolm Pirnie Inc 177 Meeting St, Charleston 29401 | (843) 853-7140 |
| Orbital Engineering 711 Meeting St, Charleston 29403 | (843) 723-7058 |
| Palmetto Gis Consulting Svc 4118 Westerly Ln, Charleston 29414 | (843) 852-0183 |
| Rosen & Assoc 65 Broad St, Charleston 29401 | (843) 577-4300 |
| Sea Box Inc 2593 Ashley River Rd, Charleston 29414 | (843) 225-8338 |
| Stantec Consulting Svc Inc 990 Morrison Dr, Charleston 29403 | (843) 577-4926 |
| T W Ryan & Assoc 8 Captiva Row, Charleston 29407 | (843) 766-4620 |
| Techfish 109 Smith St, Charleston 29403 | (843) 853-8765 |
| William B Leland Engineering 126 Williman St # B, Charleston 29403 | (843) 723-7727 |
| Vse Corp 1180 Sam Rittenberg Blvd # 330, Charleston 29407 | (843) 571-2025 |