Museum is closed temporarily until further notice.
2 Massachusetts Ave., N.E.
Washington, DC 20002
The only mail canceled on the inaugural trip of any highway route was philatelic mail.
Highway Post Office First Trip cover- Aberdeen, South Dakota to Baker, Montana
Highway Post Office First Trip cover- between Amarillo, Texas and Roswell, New Mexico
Motorized Highway Post Office Service cover- Harrisonburg, VA to Washington, DC
Highway Post Office First Trip cover- between Louisville, KY and St. Louis, MO