| District of Ontario area codes: 289 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Welland |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 289-349 | Georgetown, ON | Distributel | |
| 289-350 | Milton, ON | Distributel | |
| 289-351 | Oakville, ON | Distributel | |
| 289-352 | Waterdown, ON | Distributel | |
| 289-353 | Richmond Hill, ON | Flexity Solutions Inc | |
| 289-354 | Port Perry, ON | Telus Mobility | |
| 289-355 | Oshawa, ON | Bell Mobility | |
| 289-356 | Oshawa, ON | Bell Mobility | |
| 289-357 | Maple, ON | Telus Integrated Communications | |
| 289-358 | Hamilton, ON | Telus Integrated Communications | |
| 289-359 | Malton, ON | Telus Integrated Communications | |
| 289-360 | Cooksville, ON | Telus Integrated Communications | |
| 289-361 | Niagara Falls, ON | Telus Integrated Communications | |
| 289-362 | Saint Catharines Thorold, ON | Telus Integrated Communications | |
| 289-363 | Oakville, ON | Telus Integrated Communications | |
| 289-364 | Saint Catharines Thorold, ON | Telus Integrated Communications | |
| 289-366 | Newmarket, ON | Fibernetics Corporation | |
| 289-369 | Dunnville, ON | Allstream Inc. | |
| 289-370 | Cayuga, ON | Allstream Inc. | |
| 289-371 | Woodbridge, 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.