Prefix overview
Phone numbers in prefix 503-303
This page covers the 503-303 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
503-303
RATE CENTER
CLACKAMAS
CARRIER
MCIMETRO ACCESS TRANSMISSION SERVICES LLC
OR
Prefix range
The prefix 503-303 includes numbers from 5033030000 to 5033039999.
This range is associated with the CLACKAMAS rate center and was originally assigned to MCIMETRO ACCESS TRANSMISSION SERVICES LLC.
Numbers in this prefix
20 numbers