When the U.S. Constitution was ratified, Congress was granted power to establish post offices and mail routes — many along ...

It has grown from serving the 13 colonies to reaching nearly 169 million addresses and employing more than 635,000 people.

The one government agency that still reaches nearly every American daily — undeterred by rain, sleet, snow or even gloom of ...

The U.S. Postal Service is turning 250. Saturday’s anniversary comes as the agency faces financial challenges.