Prefix overview
Phone numbers in prefix 301-278
This page covers the 301-278 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
301-278
RATE CENTER
WSHNGTNZN5
CARRIER
MCIMETRO ACCESS TRANSMISSION SERVICES LLC
MD
Prefix range
The prefix 301-278 includes numbers from 3012780000 to 3012789999.
This range is associated with the WSHNGTNZN5 rate center and was originally assigned to MCIMETRO ACCESS TRANSMISSION SERVICES LLC.
Numbers in this prefix
20 numbers