Prefix Information
The prefix 631 is part of area code 781 serving Lexington, Massachusetts.
This exchange contains 10,000 possible phone numbers (781-631-0000 through 781-631-9999).
Phone numbers with prefix 631 in area code 781. Location: Lexington, Massachusetts.
The prefix 631 is part of area code 781 serving Lexington, Massachusetts.
This exchange contains 10,000 possible phone numbers (781-631-0000 through 781-631-9999).