Prefix overview
Phone numbers in prefix 650-378
This page covers the 650-378 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
650-378
RATE CENTER
SAN MATEO
CARRIER
PACIFIC BELL
CA
Prefix range
The prefix 650-378 includes numbers from 6503780000 to 6503789999.
This range is associated with the SAN MATEO rate center and was originally assigned to PACIFIC BELL.
Numbers in this prefix
20 numbers