Prefix Information
The prefix 503 is part of area code 959 serving Hartford, Connecticut.
This exchange contains 10,000 possible phone numbers (959-503-0000 through 959-503-9999).
Phone numbers with prefix 503 in area code 959. Location: Hartford, Connecticut.
The prefix 503 is part of area code 959 serving Hartford, Connecticut.
This exchange contains 10,000 possible phone numbers (959-503-0000 through 959-503-9999).