I’ve expanded my original OurAirports tagging to include all airports of entry and U.S. landing rights airports that I can find under Canadian or U.S. control. You can now use my tag “customs” to find either, for trip planning purposes. Here’s the map zoomed in on the Vancouver/Seattle area, showing only airports where you can clear customs:
Map of customs airports near Vancouver and Seattle
Zoom out and drag to see other parts of Canada and the U.S., or start with the full customs map.
Note that some airports have only seasonal service and/or limited operating hours, and that U.S. “landing rights” airports sometimes charge a fee for customs services. I have not included CANPASS-only airports on the map, because they are available only to pilots who have preregistered in the CANPASS program. I have also excluded unofficial (but frequently-used) customs airports like Maxson Field and Sanderson Field that are located near border crossings.