postal system

Table of Contents

References & Edit History Related Topics

Videos

What are zip codes?

For Students

postal system summary

Discover

San Francisco, California/USA-1/18/20: Womens March at Civic Center marching with signs of political protest regarding equality also embracing 2020 presidential candidates and celebrating equality

How Does the U.S. Government Define the Difference Between a Protest and a Riot?

Lake Mead (the impounded Colorado River) at the Hoover Dam. The light-coloured band of rock above the shoreline shows the decrease in water level in the first few years of the 21st century.

6 Lakes That Are Drying Up

Estimated battle casualties, Normandy invasion, World War II. WWII, D-Day

Estimated Battle Casualties During the Normandy Invasion and Campaign to Liberate Paris (June–August 1944)

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

Normandy Invasion: Omaha Beach. World War II. D-Day. Infographic. SPOTLIGHT VERSION

Facts and Figures About the Landings on Omaha Beach During the Normandy Invasion on June 6, 1944

Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

How Rye Bread May Have Caused the Salem Witch Trials

postal system: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Last Updated: May 13, 2025

Videos

What are zip codes?

See All Videos →

Topics

mail handling mail sorting postage stamp mail collection mail delivery post office postal codes franking mail cursus publicus history of publishing telecommunication military communication telemetry broadcasting water supply system mass transit regulatory agency waste disposal environmental infrastructure

Key People

Dalhousie, detail of an oil painting by Sir John Watson-Gordon, 1847; in the National Portrait Gallery, London.

James Andrew Broun Ramsay, marquess and 10th earl of Dalhousie

governor-general of India

The only woman whose name appears on the Declaration of Independence

Mary Katharine Goddard

American printer, publisher, and postmaster

Reagan, John Henninger

John Henninger Reagan

United States political leader

Hart, Sir Robert 1st Baronet

Sir Robert Hart, 1st Baronet

British statesman

Sir Rowland Hill

Sir Rowland Hill

English administrator and educator