The United States Government is the largest publisher in the world. It distributes materials in a variety of formats, including electronic, CD, microfiche, and paper.

As part of its publishing program, the U.S. Government Publishing Office (GPO) through the Federal Depository Library Program (FDLP) distributes certain classes of Government documents free of cost to designated libraries throughout the United States and its territories.

These libraries are known as Federal depository libraries.