Quiz: Special Delivery Test your knowledge of the United States Postal Service. By Debra Bell Oct. 14, 2009 | 3:14 p.m. EDT + More The Postal Clause in the Constitution allows whom to establish post offices? The president Congress State governors The American people What does the "ZIP" in ZIP code stand for? Zone Identification Place Zoning Investigation Power Zone Improvement Plan It doesn't stand for anything Who is the current postmaster general? John E. Potter James M. Stewart Samuel Osgood William J. Henderson True or false: As recently as 40 years ago, the postmaster general was part of the presidential line of succession. True False In what year were the first official U.S. postage stamps issued? 1776 1790 1814 1847 One of the most valuable stamps ever made is known as the Inverted what? Amy Jenny Lindsay Suzy Which of these actresses has not been featured on a postage stamp? Audrey Hepburn Grace Kelly Marilyn Monroe Elizabeth Taylor True or false: The official U.S. Postal Service creed begins: "Neither snow nor rain nor heat nor gloom of night ..." True False About how many post offices are there nationwide? 15,600 32,700 50,900 74,200 What U.S. landmark is featured on the Forever Stamp? The Golden Gate Bridge The Liberty Bell Mount Rushmore The Statue of Liberty Click here for the answers.