NPA-NXX - 319-504

This is the 319-504 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. 319
3. 319-504

The 319-504 subcode mainly covers Waterloo in Black Hawk 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 Miscellaneous registered to Sprint. 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 131090 comments across our systems for the 319-504 subcode.