Area Code Lookup
What Area Code Is Oshawa?
4 area codes serve Oshawa · Ontario
Oshawa is served by area codes 289, 365, 742, 905. It is located in Ontario.
Area Codes Serving Oshawa
Frequently Asked Questions
What area code is Oshawa?
Oshawa is served by area codes 289, 365, 742, 905. It is located in Ontario.
Why does Oshawa have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Oshawa now has 4 area codes — 289 and 365 and 742 and 905 — covering the same or overlapping areas.
How do I call Oshawa from outside the US?
To call Oshawa from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-289-XXX-XXXX). The +1 is the country code for all NANPA countries.