NPA-NXX - 509-420

This is the 509-420 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. 509
3. 509-420

The 509-420 subcode mainly covers Richland in Benton county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Washington state. Many of the numbers in this subcode are Regular Landline registered to At&t. We hear they employ a large number of people in the Washington office.
Recently there have been an increase in reported calls, we've had over 175177 comments across our systems for the 509-420 subcode.