• Rates for Domestic Letters, 1863-2009 (pdf) (rtf)
• Rates for Domestic Letters, 1792-1863 (pdf) (rtf)
• Rates for Stamped Cards and Postcards, 1873-2009 (pdf) (rtf)
• Pieces of Mail Handled, Number of Post Offices, Income, and Expenses, 1789 to 2009 (pdf) (htm)
• Number of Stamped Cards and Postcards Sent via First-Class Mail, 1926 to 2009 (pdf) (htm)
• Number of Employees, 1926 to 2009 (pdf) (rtf)
• Delivery Points, 1905 to 2009, in Millions (pdf) (htm)

Want bulk mail rates or PO Box rental fees since 1970? See the Postal Service's Domestic Rate History and Special Services Fee History on the Postal Regulatory Commission's Web site for rates for all categories of mail and services since 1970.

More historical statistics are available in Historical Statistics of the United States, Colonial Times to 1970, and the annual Statistical Abstract of the United States, from the U.S. Census Bureau. The Statistical Abstract, first available for 1878, offers expanded coverage of the Postal Service beginning in 1909.

The Bureau of Labor Statistics' CPI inflation calculator calculates the current values of past prices back to 1913. You can compare values back to 1774 at www.measuringworth.com.