Prefix overview
Phone numbers in prefix 313-321
This page covers the 313-321 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
313-321
RATE CENTER
DETROITZN5
CARRIER
SPOK, INC.
MI
Prefix range
The prefix 313-321 includes numbers from 3133210000 to 3133219999.
This range is associated with the DETROITZN5 rate center and was originally assigned to SPOK, INC..
Numbers in this prefix
20 numbers