See POST OFFICES and ADDRESS.
Express mail leaves our local post offices at different times. The latest is the Express Mail Facility located next to the long-term parking lot at the south end of National Airport.
Other express services in our area include FedEx, UPS, and Airborne. Some of these will open a reduced-rate monthly account for you if you request it.
Junk mail can be greatly reduced in volume by dropping a postcard to the Direct Marketing Association, Mail Preference Service, P.O. Box 9008, Farmingdale, NY 11735-9008 and asking that your name be removed from solicitation lists.