| Business | Phone |
| Amertech Engineering Inc 2750 14th Ave #203, Markham L3R 0B6 | (905) 470-8937 |
| Amr Engineering Ltd 3980 14th Ave #15, Markham L3R 0B1 | (905) 940-2655 |
| Austin Co Ltd 210 Don Park Rd #13, Markham L3R 2V2 | (905) 415-9448 |
| Azcar Technologies Inc 3235 14th Ave, Markham L3R 0H3 | (905) 470-2545 |
| Haddad Geotechnical Inc 7321 Victoria Park Ave, Markham L3R 2Z8 | (905) 475-0951 |
| Haronitis & Assoc Ltd 163 Idema Rd, Markham L3R 1A9 | (905) 474-0800 |
| Helix Engineering 90 Esna Park Dr, Markham L3R 2R7 | (905) 513-9723 |
| Katakkar Engineering Assoc Inc 2750 14th Ave #303, Markham L3R 0B6 | (905) 479-2096 |
| Kazdan & Lalji Structural 570 Hood Rd, Markham L3R 4G7 | (905) 474-5059 |
| Kazmar Associates Ltd 7300 Warden Ave #212, Markham L3R 9Z6 | (905) 475-8486 |
| National Capital Engineering 2800 14th Ave, Markham L3R 0E4 | (905) 943-4443 |
| Nexus Engineering Inc 1271 Denison St #56, Markham L3R 4B5 | (905) 947-4500 |
| Oasis Engineering 60 Columbia Way, Markham L3R 0C9 | (905) 415-1606 |
| Physical Planning Assoc Inc 100 Allstate Pky, Markham L3R 6H3 | (905) 477-4460 |
| Poulos Engineering 90 Allstate Pky, Markham L3R 6H3 | (905) 513-9511 |
| Power Line Systems Engineering 27 Sir Lancelot Dr, Markham L3P 2J1 | (905) 294-5468 |
| Pro Aqua & Shadrack Inc 400 Esna Park Dr, Markham L3R 3K2 | (905) 513-1442 |
| Sacom Asset Protctn Assoc Inc 85 Citizen Crt, Markham L6G 1A8 | (905) 479-3638 |
| Chimax Inc 3950 14th Ave, Markham L3R 0A9 | (905) 305-6133 |
| Tce Group Inc 70 Esna Park Dr #11, Markham L3R 6E7 | (416) 444-6242 |
| Teachingkindsbusiness.Com Inc 34 Chant Cres, Markham L3R 1Y8 | (905) 477-4337 |
| V E Collective Inc 3950 14th Ave, Markham L3R 0A9 | (905) 475-0436 |
| Environmental Hydraulics Group 18 Crown Steel Dr #113, Markham L3R 9X8 | (905) 415-8705 |
| Braswell Enterprises Inc 3950 14th Ave, Markham L3R 0A9 | (905) 947-1223 |
| Brosz & Assoc 64 Bullock Dr, Markham L3P 3P2 | (905) 472-6660 |
| C J Hartley Ltd 18 Sir Gareth Crt, Markham L3P 2J6 | (905) 472-6708 |
| Cansult Group Ltd 60 Renfrew Dr, Markham L3R 0E1 | (905) 470-2010 |
| Colt Engineering Corp 90 Tiverton Crt #200, Markham L3R 9V2 | (905) 940-4774 |
| Delta Engineering Svc 3950 14th Ave #502, Markham L3R 0A9 | (905) 479-1600 |
| Divide Research Inc 351 Steelcase Rd W, Markham L3R 4H9 | (905) 948-8456 |