Even though all of the postal facilities are pre-security, I have to say that PDX has done a great job of identifying them.

Official Information

Pre-Security Drop Boxes

From their site:

Mail drops are located at the North and South Service Centers in the Oregon Market. Once a day pick-ups are provided Monday thru Saturday.

The service centers appear to be close to the security checkpoints.

Pre-Security Postage Shops!

From their site:

  • Envelopes as well as first class and postcard stamps can be purchased pre-security at the The Oregonian News store near the A/B/C security checkpoint and at Your Northwest Travel Mart store near the D/E security checkpoint.
  • Postage stamps can also be purchased from the ATM located at the South Service Center in the Oregon Market Food Court (a surcharge has already been added to the cost of the stamps and no additional ATM fees are charged).

They have a fantastic map to identify where these places are!

Source

Last Updated 9 June 2017