As of 2026, the U.S. Treasury for any marketable securities (Bills, Notes, or Bonds). All new purchases are exclusively electronic .
For modern investing, you can buy Treasury bonds through the following channels: buy a us treasury bond
The Basics of Treasury Securities - Savings Bonds - TreasuryDirect As of 2026, the U
If you specifically want a "paper" bond, your only options are historic collectibles or using an IRS tax refund for Series I Savings Bonds. As of 2026