Prefix overview
Phone numbers in prefix 310-221
This page covers the 310-221 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
310-221
RATE CENTER
SAN PEDRO
CARRIER
PACIFIC BELL
CA
Prefix range
The prefix 310-221 includes numbers from 3102210000 to 3102219999.
This range is associated with the SAN PEDRO rate center and was originally assigned to PACIFIC BELL.
Numbers in this prefix
20 numbers