| District of Ontario area codes: 289 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Welland |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 289-306 | Markham, ON | Iristel Inc. | |
| 289-307 | Markham, ON | Iristel Inc. | |
| 289-308 | Hamilton, ON | Rogers Communications Partnership (wireless) | |
| 289-309 | Hamilton, ON | Fibernetics Corporation | |
| 289-312 | Oshawa, ON | Iristel Inc. | |
| 289-313 | Burlington, ON | Bell Canada | |
| 289-314 | Pickering, ON | Bell Mobility | |
| 289-315 | Pickering, ON | Distributel | |
| 289-316 | Oshawa, ON | Distributel | |
| 289-317 | Richmond Hill, ON | Distributel | |
| 289-318 | Schomberg, ON | Distributel | |
| 289-319 | Newmarket, ON | Distributel | |
| 289-320 | Fort Erie, ON | Telus Integrated Communications | |
| 289-321 | Fort Erie, ON | Rogers Communications Partnership (wireless) | |
| 289-322 | Fort Erie, ON | Fido Solutions Inc. | |
| 289-323 | Brampton, ON | Distributel | |
| 289-324 | Castlemore, ON | Distributel | |
| 289-325 | Brampton, ON | Bell Mobility | |
| 289-326 | Clarkson, ON | Distributel | |
| 289-327 | Cooksville, ON | Distributel |
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.