This will make you wonder if there’s a competition between the Potomac Heritage Trail and the Hudson River Valley Heritage Area to have the most Passport cancellations:  In December 2009, Potomac Heritage placed an order for 16 new stamps!  This brings the trail’s total to 38, reaching across three regions of the Passport program (Mid-Atlantic, National Capital and Southeast).

I’ll work on putting together a list with all of the street addresses.  In the meantime, you can download a one-sheet posted by the trail’s staff, with all of the location listed. It’s here.