Not too long ago there was an extended discussion about the shortest
international border. While doing some mapping in connection with my county
highpointing hobby, I ran across two short U.S. county common borders. I offer these
to the group without any assurance that they are the shortest, in fact
considering the 3,000+ U.S. counties, there are most likely shorter common borders.
The obvious counterpart is the longest common county border.
Macon and Monroe Counties in Missouri, estimated at about 400 feet in length:
http://topozone.com/map.asp?z=15&n=4383981.59766708%20&e=560111.101455454&u=1&
datum=nad27
Summers, West Virginia, and Giles, Virginia, estimated at about 520 feet:
http://topozone.com/map.asp?z=17&n=4142239&e=512472&s=50&size=m&u=1&layer=DRG2
5
Mike Schwartz