You have got a call from phone number beginning with 503 or 00503 or 011503 or +503 and you want to know which country is the country code 503.
Which country has 503 as dialing code?
The country code 503 (503 area code) belongs to:
503 code country is preceded either by 00 ( 00503 ) or 011 ( 011503 ) for calls made from USA and Canada and by the sign plus (+503).
Flag of El Salvador :