Prefix overview
Phone numbers in prefix 605-257
This page covers the 605-257 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
605-257
RATE CENTER
NISLAND
CARRIER
WEST RIVER COOPERATIVE TELEPHONE COMPANY
SD
Prefix range
The prefix 605-257 includes numbers from 6052570000 to 6052579999.
This range is associated with the NISLAND rate center and was originally assigned to WEST RIVER COOPERATIVE TELEPHONE COMPANY.
Numbers in this prefix
20 numbers