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

Zip Marks Fifth Anniversary with New Offices in San Francisco and New York Amid Explosive Growth; Surpasses Billions in ...

Marking 250 years, the U.S. Postal Service has shaped the nation from colonial times to the digital age, overcoming wars, ...

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