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:
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.