NPA-NXX - 503-310

This is the 503-310 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. 503-310

The 503-310 subcode mainly covers Portland in Multnomah 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 Cellular (Dedicated) registered to Verizon Wireless. 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 735334 comments across our systems for the 503-310 subcode.