Prefix overview
Phone numbers in prefix 603-423
This page covers the 603-423 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
603-423
RATE CENTER
MERRIMACK
CARRIER
CONSOLIDATED COMM OF NO. NEW ENGLAND-NH
NH
Prefix range
The prefix 603-423 includes numbers from 6034230000 to 6034239999.
This range is associated with the MERRIMACK rate center and was originally assigned to CONSOLIDATED COMM OF NO. NEW ENGLAND-NH.
Numbers in this prefix
20 numbers