NPA-NXX - 503-406

This is the 503-406 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. 503
3. 503-406

The 503-406 subcode mainly covers Clackamas in Clackamas county. But other numbers maybe included as well.

We have a database of information derived from the public phone records of Oregon state. Many of the numbers in this subcode are Regular Landline registered to Level 3. We hear they employ a large number of people in the Oregon office.
Recently there have been an increase in reported calls, we've had over 375992 comments across our systems for the 503-406 subcode.