| District of Ontario area codes: 519 | |
|---|---|
| Country | Canada |
| State/Province | Ontario |
| Major City | Comber |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 519-323 | Mount Forest, ON | Bell Canada | |
| 519-324 | Leamington, ON | Bell Canada | |
| 519-325 | Leamington, ON | Bell Canada | |
| 519-326 | Leamington, ON | Bell Canada | |
| 519-327 | Clifford, ON | Wightman Telephone Ltd. | |
| 519-328 | Sarnia, ON | Telus Mobility | |
| 519-329 | Leamington, ON | Rogers Communications Partnership (wireless) | |
| 519-330 | Sarnia, ON | Telus Mobility | |
| 519-331 | Sarnia, ON | Bell Mobility | |
| 519-332 | Sarnia, ON | Bell Canada | |
| 519-333 | Sarnia, ON | Bell Canada | |
| 519-334 | Holstein, ON | Bell Canada | |
| 519-335 | Gorrie, ON | Wightman Telephone Ltd. | |
| 519-336 | Sarnia, ON | Bell Canada | |
| 519-337 | Sarnia, ON | Bell Canada | |
| 519-338 | Harriston, ON | Bell Canada | |
| 519-339 | Sarnia, ON | Bell Canada | |
| 519-340 | Kitchener, ON | Allstream Inc. | |
| 519-341 | Guelph, ON | Rogers Communications Partnership (cable) | |
| 519-342 | Kitchener, ON | Rogers Communications Partnership (cable) |
There are 779 prefixes, In the code area, the major cities are Dutton, ON;Teeswater, ON;Wheatley, ON;Goderich, ON. The major city is Dutton.