As an independent agency of the government, the United States Postal Service homepage offers information on zip codes, address change, stamps, online billing, and variety of other topics.

This online exhibit takes students through various means of delivering mail via land, sea, and air. Historic, primary materials are used throughout the exhibit.

This online exhibit tells the story of the mail service in the rural and urban areas in the 20th century. Historic, primary materials are used throughout the exhibit.