| Business | Phone |
| Stirling Design Inc 4 Landmark Rd, Westford 1886 | (978) 692-2620 |
| Professional Engineering Svc 19 Crown Rd, Westford 1886 | (978) 692-4143 |
| Orion Engineering Corp Po Box 2073, Westford 1886 | (978) 589-9850 |
| Digital Voice Systems Inc 234 Littleton Rd, Westford 1886 | (978) 392-0002 |
| Diversified Civil Engineering 359 Littleton Rd, Westford 1886 | (978) 692-0939 |
| North East Systems Assoc 5 Lan Dr # 200 Pri, Westford 1886 | (978) 392-8787 |
| Dufresne Henry Inc 5 Lan Dr # 300, Westford 1886 | (978) 692-1913 |