Prefix Information
The prefix 503 is part of area code 904 serving Jacksonville, Florida.
This exchange contains 10,000 possible phone numbers (904-503-0000 through 904-503-9999).
Phone numbers with prefix 503 in area code 904. Location: Jacksonville, Florida.
The prefix 503 is part of area code 904 serving Jacksonville, Florida.
This exchange contains 10,000 possible phone numbers (904-503-0000 through 904-503-9999).