| Business | Phone |
| Alfred Benesch & Co 222 N Washington Sq 200, Lansing 48933 | (517) 482-1682 |
| Wilbur Smith Assoc 6709 Centurion Dr 220, Lansing 48917 | (517) 323-0500 |
| Wilcox Professional Svc 111 W Edgewood Blvd 7, Lansing 48911 | (517) 882-4359 |
| Tetra Tech Mps 1921 E Miller Rd A, Lansing 48911 | (517) 394-7900 |
| Bergmann Associates 4095 Legacy Pkwy, Lansing 48911 | (517) 272-9835 |
| Ceso Inc 8164 Executive Dr, Lansing 48917 | (517) 327-2860 |
| Retec Group 3900 Collins Rd, Lansing 48910 | (517) 324-9200 |
| R W Armstrong & Assoc 4100 Capitol City Blvd 2, Lansing 48906 | (517) 327-1980 |
| Engineering Applications Inc 815 Coolidge Rd 307, Lansing 48912 | (517) 337-4422 |
| Nth Consultants 608 S Washington Ave, Lansing 48933 | (517) 321-6900 |
| Nu-Concepts Inc 5825 Whitehaven Dr, Lansing 48917 | (517) 321-6691 |
| Nylander Engineering Inc 5320 Ivan Dr, Lansing 48917 | (517) 886-8488 |
| Fishbeck Thompson Carr & Huber 7402 Westshire Dr 110, Lansing 48917 | (517) 627-1141 |
| Graphtec Industries 3130 Sovereign Dr, Lansing 48911 | (517) 394-1327 |
| Great Lakes Engineering Group 521 Seymour Ave, Lansing 48933 | (517) 363-4400 |
| Nelson Tank Engineering Inc 16240 National Pkwy, Lansing 48906 | (517) 321-1692 |
| Hinshon Environmental Cnsltng 124 W Allegan St 1508, Lansing 48933 | (517) 372-1470 |
| Mannik & Smith Group Inc 721 N Capitol Ave, Lansing 48906 | (517) 316-9232 |
| Matrix Consulting Engineers 1601 E Grand River Ave, Lansing 48906 | (517) 487-2511 |
| Mayotte Design & Engineering 2407 Boston Blvd, Lansing 48910 | (517) 367-2674 |
| Mead & Hunt Inc 2605 E Airport Service Dr, Lansing 48906 | (517) 321-8334 |
| Isra Vision Systems 3350 Pinetree Rd, Lansing 48911 | (517) 887-8878 |
| Lectronix Inc 5858 Enterprise Dr, Lansing 48911 | (517) 492-0030 |