Prefix overview
Phone numbers in prefix 303-421
This page covers the 303-421 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
303-421
RATE CENTER
DENVER
CARRIER
QWEST CORPORATION
CO
Prefix range
The prefix 303-421 includes numbers from 3034210000 to 3034219999.
This range is associated with the DENVER rate center and was originally assigned to QWEST CORPORATION.
Numbers in this prefix
20 numbers