NPA-NXX - 289-378

This is the 289-378 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 289
3. 289-378

The 289-378 subcode mainly covers Markham in York county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Ontario state. Many of the numbers in this subcode are Regular Landline registered to Fibernet. We hear they employ a large number of people in the Ontario office.
Recently there have been an increase in reported calls, we've had over 1032524 comments across our systems for the 289-378 subcode.