| District of Ontario area codes: 905 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Richmond Hill |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 905-200 | Castlemore, ON | Rogers Communications Partnership (cable) | |
| 905-201 | Markham, ON | Bell Canada | |
| 905-202 | Markham, ON | Rogers Communications Partnership (cable) | |
| 905-203 | Milton, ON | Rogers Communications Partnership (cable) | |
| 905-204 | Castlemore, ON | Rogers Communications Partnership (cable) | |
| 905-205 | Markham, ON | Rogers Communications Partnership (cable) | |
| 905-206 | Cooksville, ON | Bell Canada | |
| 905-207 | Cobourg, ON | Telus Mobility | |
| 905-208 | Oakville, ON | Telus Mobility | |
| 905-209 | Markham, ON | Bell Canada | |
| 905-210 | Cooksville, ON | Bell Canada | |
| 905-212 | Cooksville, ON | Bell Canada | |
| 905-213 | Oshawa, ON | Bell Mobility | |
| 905-214 | Cooksville, ON | Bell Canada | |
| 905-215 | Oshawa, ON | Allstream Inc. | |
| 905-216 | Brampton, ON | Rogers Communications Partnership (cable) | |
| 905-217 | Whitby, ON | Rogers Communications Partnership (cable) | |
| 905-218 | Hamilton, ON | Globility | |
| 905-219 | Cooksville, ON | Bell Canada | |
| 905-220 | Burlington, ON | Rogers Communications Partnership (wireless) |
There are 770 prefixes, In the code area, the major cities are Stouffville, ON;Fisherville, ON;Richmond Hill, ON;. The major city is Stouffville.