Area Code Lookup
What Area Code Is Newmarket?
3 area codes serve Newmarket · Ontario
Newmarket is served by area codes 289, 365, 905. It is located in Ontario.
Area Codes Serving Newmarket
Frequently Asked Questions
What area code is Newmarket?
Newmarket is served by area codes 289, 365, 905. It is located in Ontario.
Why does Newmarket 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). Newmarket now has 3 area codes — 289 and 365 and 905 — covering the same or overlapping areas.
How do I call Newmarket from outside the US?
To call Newmarket 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.