The whole issue of the “smallest county in the United States” has been covered thoroughly in previous entries, but there is still on more oddity of note: The smallest self-governing county and the smallest independent city share a common border!
Arlington’s far western border runs straight along the entirety of Falls Church’s eastern border. This line is part of the original District of Columbia boundary described in the previous post. What was known as the “west cornerstone” when it was surveyed now stands at the northernmost point that the two jurisdictions share. To make that situation even more interesting, Fairfax County also joins at that point, resulting in three geographic entities touching at the stone.
In this photograph, Falls Church is on the left side of the line and Arlington is on the right. Fairfax joins them at the stone enclosed within the cast iron fence in the distance. A quick final summary of posts in this series:
Source of map: U.S. Census Tiger Map