| Business | Phone |
| Abacus Engineered Systems 401 2nd Ave S 201, Seattle 98104 | (206) 583-0200 |
| Aes Pacific 192 Nickerson St # 306, Seattle 98109 | (206) 282-6364 |
| Atkinson & Assoc Inc 1936 8th Ave W, Seattle 98119 | (206) 281-8122 |
| Cierra Electrical Group Inc 2505 3rd Ave 204, Seattle 98121 | (206) 442-0112 |
| Elcon Engineering Consultants 18000 Pacific Hwy S 1115, Seattle 98188 | (206) 243-5022 |
| Electronic Programming & Dsgn 7114 17th Ave Sw, Seattle 98106 | (206) 767-7262 |
| J Omega Engineering 815 1st Ave, Seattle 98104 | (206) 855-4600 |
| Hargis Engineers 600 Stewart St 1000, Seattle 98101 | (206) 448-3376 |
| Herman Theriault Consulting 6920 California Ave Se # 45, Seattle 98116 | (206) 937-8363 |
| Gerber & Vail Inc 506 2nd Ave 22, Seattle 98104 | (206) 405-3510 |