905 Area Code — Ontario
905 is a North American Numbering Plan area code for Ontario, Canada. It covers about 0 people in 20 towns, including Markham, Milton and Cobourg.
| Field | Value |
|---|---|
| Area code | 905 |
| Country | Canada (+1) |
| State / province | Ontario |
| Type | Shares its towns with 289 |
| Time zone | Eastern |
| Population covered | 0 |
| Towns covered | 20 |
| Approx. centre | 43.565, -79.333 |
Where area code 905 is used
Area code 905 is assigned to Ontario, Canada, inside the North American Numbering Plan. Numbers in the code are written (905) NXX-XXXX at home and +1 905 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 289. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 905
The 20 towns below are the largest in the 905 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Markham | — | — | |
| Milton | — | — | |
| Cobourg | — | — | |
| Oakville | — | — | |
| Oshawa | — | — | |
| Brampton | — | — | |
| Hamilton | — | — | |
| Burlington | — | — | |
| Richmond Hill | — | — | |
| St. Catharines | — | — | |
| Ajax | — | — | |
| Newmarket | — | — |
Other area codes serving the same towns
Nearby area codes
How to dial area code 905
- Within North America: 905 + 7-digit number (905-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 905, then the 7-digit number — for example 00 1 905 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 905?
905 is a North American Numbering Plan area code assigned to Ontario, Canada. It covers about 0 people in 20 towns.
Is 905 a US or Canadian area code?
905 is a Canadian area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 905 in?
Area code 905 is in the Eastern time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.