NPA-NXX - 405-521

This is the 405-521 subcode (NPA-NXX) prefix page. Follow a prefix to find the number you are looking for. We divide our pages up to make them more user friendly to navigate!

1. Area Codes
2. 405
3. 405-521

The 405-521 subcode mainly covers Oklahoma City in Oklahoma county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Oklahoma state. Many of the numbers in this subcode are Regular Landline registered to At&t Southwest. We hear they employ a large number of people in the Oklahoma office.
Recently there have been an increase in reported calls, we've had over 718633 comments across our systems for the 405-521 subcode.