Prefix overview
Phone numbers in prefix 640-644
This page covers the 640-644 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
640-644
RATE CENTER
MEDFORD
CARRIER
ONVOY SPECTRUM, LLC
NJ
Prefix range
The prefix 640-644 includes numbers from 6406440000 to 6406449999.
This range is associated with the MEDFORD rate center and was originally assigned to ONVOY SPECTRUM, LLC.
Numbers in this prefix
20 numbers