| District of Ontario area codes: 289 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Welland |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 289-200 | Pickering, ON | Rogers Communications Partnership (wireless) | |
| 289-201 | Brampton, ON | Iristel Inc. | |
| 289-202 | Kleinburg, ON | Rogers Communications Partnership (cable) | |
| 289-203 | Stoney Creek, ON | Iristel Inc. | |
| 289-204 | Ancaster, ON | Iristel Inc. | |
| 289-205 | Grimsby, ON | Iristel Inc. | |
| 289-206 | Bolton, ON | Iristel Inc. | |
| 289-207 | King City, ON | Iristel Inc. | |
| 289-208 | Burlington, ON | Rogers Communications Partnership (wireless) | |
| 289-209 | Dunnville, ON | Rogers Communications Partnership (wireless) | |
| 289-210 | Oak Ridges, ON | Iristel Inc. | |
| 289-212 | Stouffville, ON | Iristel Inc. | |
| 289-213 | Saint Catharines Thorold, ON | Bell Mobility | |
| 289-214 | Saint Catharines Thorold, ON | Bell Mobility | |
| 289-215 | Cobourg, ON | Bell Mobility | |
| 289-216 | Kleinburg, ON | Iristel Inc. | |
| 289-217 | Maple, ON | Iristel Inc. | |
| 289-218 | Oakville, ON | Rogers Communications Partnership (wireless) | |
| 289-219 | Saint Catharines Thorold, ON | Bell Mobility | |
| 289-220 | Whitby, ON | Telnet Communications |
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.