The history of the United States Postal Service is rooted in a single, great principle: that every person in the United States – no matter who, no matter where – has the right to equal access to secure, efficient, and affordable mail service.

• Delivery: Monday through Saturday since 1863 (pdf) (rtf)
• City Delivery (pdf) (rtf)
• Deliveries per Day (pdf) (rtf)
• Rural Free Delivery (pdf) (rtf)
• First Rural Routes by State
• State Abbreviations (pdf) (htm)
• Postal Service Mission and "Motto" (pdf) (rtf)
• Universal Service and the Postal Monopoly:
  A Brief History (pdf) (txt)
• Past Postal Programs
• E-COM, Electronic Computer Originated Mail (pdf) (rtf)
• Mr. ZIP (pdf) (rtf)
• Postal Savings System (pdf) (rtf)
• Telegraph: Early Postal Role (pdf) (rtf)
• V-Mail (pdf) (rtf)
• Unique Deliveries
• Hope Diamond Delivered by Mail (pdf) (rtf)
• A Letter, a Lad, and a Lizard (pdf) (rtf)