Q. Where can I find historical rates for U.S. treasury bills, notes, and bonds?

• Go to Treasury Bill, Note, and Bond Auction History

• Go to the Board of Governors of the Federal Reserve and click on Economic Research and Data

• Go to Interest Rates - Federal Reserve Bank of St. Louis - FRED

• Also use Thomson One Banker: Analytics Module

Click on the Markets tab, then the US Treasury tab.
Data is available for the 3M, 6M. 2Y, 3Y, 5Y, 10Y, 30Y.