| District of Ontario area codes: 905 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Richmond Hill |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 905-409 | Pickering, ON | Rogers Communications Partnership (wireless) | |
| 905-410 | Oshawa, ON | Bell Mobility | |
| 905-412 | Streetsville, ON | Allstream Inc. | |
| 905-413 | Unionville, ON | Bell Canada | |
| 905-414 | Welland, ON | Bell Mobility | |
| 905-415 | Unionville, ON | Bell Canada | |
| 905-417 | Maple, ON | Bell Canada | |
| 905-418 | Thornhill, ON | Allstream Inc. | |
| 905-419 | Bowmanville, ON | Rogers Communications Partnership (cable) | |
| 905-420 | Southpick, ON | Bell Canada | |
| 905-421 | Southpick, ON | Bell Canada | |
| 905-422 | Southpick, ON | Rogers Communications Partnership (cable) | |
| 905-423 | Pickering, ON | Rogers Communications Partnership (cable) | |
| 905-424 | Pickering, ON | Bell Canada | |
| 905-425 | Brooklin, ON | Rogers Communications Partnership (cable) | |
| 905-426 | Pickering, ON | Bell Canada | |
| 905-427 | Pickering, ON | Bell Canada | |
| 905-428 | Pickering, ON | Bell Canada | |
| 905-429 | Oshawa, ON | Bell Canada | |
| 905-430 | Whitby, ON | Bell Canada |
There are 770 prefixes, In the code area, the major cities are Stouffville, ON;Fisherville, ON;Richmond Hill, ON;. The major city is Stouffville.