Prefix overview
Phone numbers in prefix 303-307
This page covers the 303-307 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
303-307
RATE CENTER
DENVER
CARRIER
QWEST CORPORATION
CO
Prefix range
The prefix 303-307 includes numbers from 3033070000 to 3033079999.
This range is associated with the DENVER rate center and was originally assigned to QWEST CORPORATION.
Numbers in this prefix
20 numbers