Telephone exchanges are the first three digits of your phone number after the area code e.g. 905-555-1234 (in this case the exchange is 555). It is ususally associated with a specific geographical area. Below are exchanges for the 905 area code in Mississauga
| Clarkson | 403, 822, 823 |
| Cooksville | 206, 212, 214, 219, 232, 238, 241, 247, 267 268 270 272 273 275 276 277 279 281 282 283 290 306 361 366 402 501 502 507 566 568 602 614 615 624 625 629 712 755 756 766 803 804 848 890 896 897 949 |
| Malton | 234.255.256.293.298.362.364.405.461.564.565.612.670.671.672.673.676.677.678.694.696.698.740.795.908.956 |
| Port Credit | 221.271.274.278.486.891.990 |
| Streetsville | 285.286.288.301.302.363.369.412.542.567.569.593.600.601.603.603.606.607.608.609.785.812.813.814.816.817.819.820.821.824.826.828.858.997 |
