Prefix Information
The prefix 503 is part of area code 217 serving Springfield, Illinois.
This exchange contains 10,000 possible phone numbers (217-503-0000 through 217-503-9999).
Phone numbers with prefix 503 in area code 217. Location: Springfield, Illinois.
The prefix 503 is part of area code 217 serving Springfield, Illinois.
This exchange contains 10,000 possible phone numbers (217-503-0000 through 217-503-9999).