Prefix Information
The prefix 640 is part of area code 507 serving Rochester, Minnesota.
This exchange contains 10,000 possible phone numbers (507-640-0000 through 507-640-9999).
Phone numbers with prefix 640 in area code 507. Location: Rochester, Minnesota.
The prefix 640 is part of area code 507 serving Rochester, Minnesota.
This exchange contains 10,000 possible phone numbers (507-640-0000 through 507-640-9999).