1639
In Boston, a former tavern became America’s first Post Office™ store
						
						1775
Benjamin Franklin appointed as the first Postmaster General
						1792
United States Post Office Department (predecessor of USPS) established
						
						1815
First contract authorized for steamboats to carry mail
						1832
First contract authorized for railroads to carry mail
						1833
Abraham Lincoln appointed postmaster of New Salem, Illinois
						1847
First postage stamps issued
						1858
Street letter boxes installed
						1860
Pony Express began operation
						1863
Free delivery began in cities
						1864
Domestic money orders introduced
						1893
First commemorative stamps issued
						1896
Rural free delivery began
						
						1918
Airmail took flight
						1942
V-Mail enabled rapid communication between the warzone and the home front
						1963
ZIP Code™ system introduced
						1971
United States Postal Service began operations as an independent agency following the Postal Reorganization Act
						1991
Priority Mail Flat Rate® and Express Mail Flat Rate™ envelopes introduced
						1992
Self-adhesive stamps introduced
						1993
The Smithsonian National Postal Museum opened
						1994
USPS.com® website launched
						1998
First U.S. semipostal stamp issued
						
						2004
Priority Mail Flat Rate® Box introduced – If it fits, it ships®
						2007
First Forever® stamp issued
						2014
Sunday package delivery began in high-volume areas during holiday season
						2017
Informed Delivery® service became available nationwide
						2021
Delivering for America® plan introduced