NPA-NXX - 515-604

This is the 515-604 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. 515
3. 515-604

The 515-604 subcode mainly covers Humboldt in Humboldt county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Iowa state. Many of the numbers in this subcode are Regular Landline registered to Goldfield Telephone Company. We hear they employ a large number of people in the Iowa office.
Recently there have been an increase in reported calls, we've had over 9815 comments across our systems for the 515-604 subcode.