Open daily 10 a.m. to 5:30 p.m.
Admission is always free!
2 Massachusetts Ave., N.E.
Washington, DC 20002
The museum's main entrance is located on the corner of First Street and Massachusetts Avenue NE. Other entrances have variable hours.
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