Prefix overview
Phone numbers in prefix 240-378
This page covers the 240-378 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
240-378
RATE CENTER
CUMBERLAND
CARRIER
CORE COMMUNICATIONS, INC.- MD
MD
Prefix range
The prefix 240-378 includes numbers from 2403780000 to 2403789999.
This range is associated with the CUMBERLAND rate center and was originally assigned to CORE COMMUNICATIONS, INC.- MD.
Numbers in this prefix
20 numbers