| Business | Phone |
| B P & R Engineering Inc 456 Century Ln, Holland 49423 | (616) 392-9785 |
| Bannach Consulting & Svc 880 Maywood Ave, Holland 49424 | (616) 399-0824 |
| Collins Engineers Inc 697 Ottawa Beach Rd, Holland 49424 | (616) 392-3500 |
| Varatech Consulting Engineers 305 Hoover Blvd 700, Holland 49423 | (616) 393-6408 |