Prefix overview
Phone numbers in prefix 640-300
This page covers the 640-300 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
640-300
RATE CENTER
MILMAY
CARRIER
ONVOY, LLC - NJ
NJ
Prefix range
The prefix 640-300 includes numbers from 6403000000 to 6403009999.
This range is associated with the MILMAY rate center and was originally assigned to ONVOY, LLC - NJ.
Numbers in this prefix
20 numbers