NPA-NXX - 206-400

This is the 206-400 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. 206
3. 206-400

The 206-400 subcode mainly covers Des Moines in King 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 Xo Communications. 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 1931249 comments across our systems for the 206-400 subcode.