NPA-NXX - 520-437

This is the 520-437 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. 520
3. 520-437

The 520-437 subcode mainly covers Tucson in Pima county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Arizona state. Many of the numbers in this subcode are Regular Landline registered to Xo Communications. We hear they employ a large number of people in the Arizona office.
Recently there have been an increase in reported calls, we've had over 980263 comments across our systems for the 520-437 subcode.