Plus uno

 

Alphabetical won't work because one they are all re-positioned, every portal would need to be moved again once a new town applies.

I would think an easier system would be to just add a number the portal.

Put a sign above each one with a number.

This way Andrew doesn't have to redo every single portal. We were able to add a ladder for when Ext Creations isn't working so adding signs (and locking them) shouldn't take all that long.

RagMan

 

The towns are in some order, the older towns will be on the top floor, in the first row, with the newer ones in the further back rows. This continues for every floor.
But i agree, it is a pain looking for a certain town with relatively no order, unless you know how old the town is, but still then, its a guessing game