| District of Ontario area codes: 289 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Welland |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 289-265 | Colborne, ON | Telus Integrated Communications | |
| 289-266 | Burlington, ON | Telus Integrated Communications | |
| 289-267 | Saint Catharines Thorold, ON | Telus Integrated Communications | |
| 289-268 | Woodbridge, ON | Telus Integrated Communications | |
| 289-269 | Richmond Hill, ON | Telus Integrated Communications | |
| 289-270 | Milton, ON | Iristel Inc. | |
| 289-271 | Niagara Falls, ON | Iristel Inc. | |
| 289-272 | Niagara On The Lake, ON | Iristel Inc. | |
| 289-273 | Saint Catharines Thorold, ON | Iristel Inc. | |
| 289-274 | Oshawa, ON | Iristel Inc. | |
| 289-275 | Pickering, ON | Iristel Inc. | |
| 289-276 | Bowmanville, ON | Iristel Inc. | |
| 289-277 | Southpick, ON | Iristel Inc. | |
| 289-278 | Whitby, ON | Iristel Inc. | |
| 289-279 | Newmarket, ON | Telus Integrated Communications | |
| 289-280 | Mount Hope, ON | Allstream Inc. | |
| 289-281 | Mount Hope, ON | Allstream Inc. | |
| 289-282 | Hagersville, ON | Allstream Inc. | |
| 289-283 | Hagersville, ON | Allstream Inc. | |
| 289-284 | Caledonia, ON | Allstream Inc. |
There are 640 prefixes, In the code area, the major cities are Oakville, ON;Colborne, ON;Welland, ON;Vineland, ON. The major city is Oakville.