United States Postal Service
The United States Postal Service, or US Mail, was a government mail delivery service, which existing on Earth in the United States of America, which superseded the Post Office Department beginning in the latter half of the 20th century.

In 1986, a United States Postal Service truck passed by Commander Pavel Chekov and Commander Nyota Uhura while they were asking people where the nuclear vessels were located. ()

A mailbox featuring the USPS logo, updated since 1986, was present in a Detroit street in 2004. ()

Appendices

Background information 

A thirty-three cent Star Trek stamp was released on  as part of its "Celebrate the Century" initiative. Later that year, Hallmark also distributed the stamp as the centerpiece of a Christmas ornament. 

On  in celebration of Star Treks 50th anniversary, four new US Star Trek stamps created by Jason Kernevich and Dustin Summers premiered at the Star Trek: Mission New York convention with Walter Koenig in attendance.

External links
  – official site
 

Earth establishments
Earth agencies