Barney Circle - in SE
Additional traffic circles have been added to the MAR. Their locations can be found by going to the MAR Sample Client and typing in their respective names.
One of the sources for this information was from Wikipedia. In the Wikipedia article it mentions an Ellicott Circle. Ellicott Circle does not currently exist. It did exist decades ago (see below Baist Index image transposed over 2009 Imagery)
Ellicott Circle SE (from Baist Index) Transposed over 2009 Imagery