There is more than one postal code in Stratford. You could get it from Canada Post website, by providing the full address you are looking for.
The country code and area code of Stratford-upon-Avon, United Kingdom is 44, (0)1789.
The Stratford area uses the standard all-London area code, which is 020. A full Stratford number would be 11 digits long, such as 020 7946 0018. There are other places in England with similar names. For example, Stratford-upon-Avon, where William Shakespeare was born, is in area code 01789. In either case, when calling from outside the UK, replace the leading '0' of the area code with the country code +44.
Area code 613 and overlay area code 343 serve eastern Ontario, Canada, including Ottawa. There are no reliable statistics on the population in that specific region.
Area Code 647State: Ontario Major City: TorontoTimezone: Eastern
Area code 323 is located in that famous part of Ontario, Canada, called "downtown Los Angeles, California, USA."
Please be more specific. It appears you are looking for the area code for a town named Stratford, but you did not say in what country/state/province/etc.
Area code 647 is the city of Toronto, Ontario, Canada, in an overlay on area code 416.
Area code 343 has been assigned in Canada, to overlay the 613 area code in Eastern Ontario. This area includes Ottawa
Area code 613 (and overlay area code 343) is Ottawa, Ontario, Canada, and nearby areas. The 613-909 prefix is in Ottawa.
North York is part of the city of Toronto, Ontario. The city of Toronto uses area code 416 and overlay code 647, with an additional overlay 437 coming in 2013. The near suburbs of Toronto use area code 905 and overlay code 289, with an additional overlay 365 coming in 2013.
Area code 909 is in southern California, including San Bernardino and Ontario.