| General Information about Area Code 289 | |
|---|---|
| Country | Canada |
| State / Province / Territory | Ontario |
| Major City | Unionville |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | Phone Type |
|---|---|---|
| 289-763 | Newmarket | Wireless |
| 289-916 | Castlemore | Landline |
| 289-825 | Clarkson | Landline |
| 289-351 | Oakville | Landline |
| 289-295 | Oakville | Landline |
| 289-479 | Saint Catharines Thorold | Landline |
| 289-940 | Oakville | Landline |
| 289-807 | Thornhill | Landline |
| 289-828 | Burlington | Wireless |
| 289-405 | Oshawa | Wireless |
| 289-468 | Maple | Landline |
| 289-877 | Hamilton | Wireless |
| 289-889 | Brampton | Wireless |
| 289-205 | Grimsby | Landline |
| 289-757 | Caledonia | Landline |
| 289-815 | Oakville | Landline |
| 289-747 | Brampton | Landline |
| 289-919 | Hamilton | Landline |
| 289-388 | Pickering | Wireless |
| 289-251 | Cobourg | Wireless |