Prefix overview
Phone numbers in prefix 603-478
This page covers the 603-478 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
603-478
RATE CENTER
HLLSBUPVLG
CARRIER
GRANITE STATE TEL., INC.
NH
Prefix range
The prefix 603-478 includes numbers from 6034780000 to 6034789999.
This range is associated with the HLLSBUPVLG rate center and was originally assigned to GRANITE STATE TEL., INC..
Numbers in this prefix
20 numbers