Historical Marker
Mercury
Historical marker location:
600 Independence Southwest, The National Mall, District of Columbia
( Marker is on Jefferson Drive Southwest west of 4th Street Southwest, on the right when traveling east.)
Marker installed: 2013
The District was originally called "Federal City": The name "Washington, D.C." was not officially adopted until the late 19th century. Before that, the city was referred to as "Federal City" or simply "Washington."