| State | Major City | Time Zone |
|---|---|---|
| OntarioCanada | Toronto | Eastern |
| Prefix | City 1 | City 2 | City 3 | City 4 | City 5 |
|---|---|---|---|---|---|
| 437 | Toronto |
| Prefix | Primary City | Company | County | Usage | Introduced |
|---|---|---|---|---|---|
| 437 - 222 | Toronto, ON | Beanfield Technologies Inc. | Landline | ||
| 437 - 266 | Toronto, ON | Comwave Networks | Landline | ||
| 437 - 345 | Toronto, ON | Telus Mobility | Cell Number | ||
| 437 - 540 | Toronto, ON | Telus Mobility | Cell Number | ||
| 437 - 580 | Toronto, ON | Telus Mobility | Cell Number | ||
| 437 - 588 | Toronto, ON | Telus Mobility | Cell Number | ||
| 437 - 800 | Toronto, ON | Iristel Inc. | Landline | ||
| 437 - 836 | Toronto, ON | Allstream Inc. | Landline | ||
| 437 - 886 | Toronto, ON | Fibernetics Corporation | Landline | ||
| 437 - 887 | Toronto, ON | Fibernetics Corporation | Landline | ||
| 437 - 888 | Toronto, ON | Fibernetics Corporation | Landline | ||
| 437 - 889 | Toronto, ON | Fibernetics Corporation | Landline |