| Business | Phone |
| A A Tech Scientific Inc 325 Dalhousie St #910, Ottawa K1N 7G2 | (613) 789-6333 |
| A J Garwood & Assoc 311 Richmond Rd, Ottawa K1Z 6X3 | (613) 792-4111 |
| Altec Advanced Technology 75 Albert St, Ottawa K1P 5E7 | (613) 565-3620 |
| J Stuart Hall & Assoc Ltd 254 Friel St, Ottawa K1N 7V9 | (613) 789-0261 |
| Jp2g Consultants Inc 1140 Morrison Dr #200, Ottawa K2H 8S9 | (613) 828-7800 |
| Kriger Engineering Ltd 1883 Ferncroft Cres, Ottawa K1H 7B4 | (613) 521-9081 |
| D L Costford & Assoc Inc 1716 Woodward Dr #300, Ottawa K2C 0P8 | (613) 226-7711 |
| Laviolette Engineering Inc 1400 Highgate Rd #204, Ottawa K2C 2Y6 | (613) 820-3838 |
| Leekor Engineering Inc 359 Kent St #300, Ottawa K2P 0R6 | (613) 234-0886 |
| M E Andrews & Assoc Ltd 39 Putman Ave #27, Ottawa K1M 1Z1 | (613) 741-4673 |
| M E Andrews & Assoc Ltd 211 Wurtemburg St, Ottawa K1N 8R4 | (613) 244-2000 |
| Mansour & Assoc Ltd 2150 Thurston Dr #203, Ottawa K1G 5T9 | (613) 247-9229 |
| Mc Rostie Genest St Louis 1755 Woodward Dr #201, Ottawa K2C 0P9 | (613) 228-7088 |
| Mil Systems 1150 Morrison Dr #200, Ottawa K2H 8S9 | (613) 726-0500 |
| Morrison Hershfield Managers 2440 Don Reid Dr, Ottawa K1H 1E1 | (613) 739-2910 |
| Noxon Associates Ltd 48 Gordon St, Ottawa K1S 4C8 | (613) 565-8836 |
| Pro-Bel Enterprises Ltd 85 Picasso Dr, Ottawa K1G 5S7 | (613) 247-1799 |
| R J Mc Kee Engineering Ltd 1785 Woodward Dr, Ottawa K2C 0P9 | (613) 723-9585 |
| Rideau Oxford Engineering Inc 130 Slater St #750, Ottawa K1P 6E2 | (613) 598-4670 |
| S T Engineering Inc 1869 Carling Ave #205, Ottawa K2A 1E6 | (613) 798-0969 |
| Swiderski Engineering 901 Bank St, Ottawa K1S 3W5 | (613) 829-8248 |
| Valcom Limited 85 Albert St #300, Ottawa K1P 6A4 | (613) 594-5200 |
| Zurcher-Smith-Amond Inc 1390 Prince Of Wales Dr #107, Ottawa K2C 3N6 | (613) 731-6111 |
| Cirrus Engineering Inc 324 Bronson Ave, Ottawa K1R 6J3 | (613) 234-7561 |
| Daido Group Inc 2000 Thurston Dr #23b, Ottawa K1G 4K7 | (613) 738-3193 |
| Design & Systems Inc 2380 Holly Lane #200, Ottawa K1V 7P1 | (613) 739-7482 |