These are the primary telephone area codes for Oshawa and the eastern Greater Toronto Area (GTA) in southern Ontario.
How to Call Oshawa from Overseas
- Dial your country's exit code (International Access Code)
- Dial 1 (Canada country code)
- Dial the area code (905, 289, or 365)
- Dial the 7-digit local phone number
Example: Calling Oshawa from the UK
00 1 905 555 1234
Where:
00 = UK exit code
1 = Canada country code
905 = Oshawa area code
555 1234 = Local Oshawa phone number
Quick Facts
Oshawa Area Code Coverage
These area codes serve Oshawa and key communities in Durham Region:
905 - Original Eastern GTA
Oshawa, Whitby, Ajax, Pickering, Bowmanville
289 - First Overlay (2001)
Added to relieve number exhaustion across the 905 region
365 - Second Overlay (2013)
Supports ongoing growth in Durham and surrounding areas
Downtown Oshawa
King Street, GM Centre, Ontario Tech University
North Oshawa
Windfields, Taunton Road, Lake Ridge Road corridor
South Oshawa
Lakefront, Harbour, and historic automotive districts
Major Canadian Area Codes
Common Exit Codes for Calling Canada
When calling Oshawa from these countries, use these exit codes:
United Kingdom
00
Australia
0011
European Union
00
Japan
010
China
00
United States
011