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