Prefix overview
Phone numbers in prefix 203-318
This page covers the 203-318 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
203-318
RATE CENTER
MADISON
CARRIER
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
CT
Prefix range
The prefix 203-318 includes numbers from 2033180000 to 2033189999.
This range is associated with the MADISON rate center and was originally assigned to SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT.
Numbers in this prefix
20 numbers