The Treasury Department auctioned $11 billion of 29-year, 10-month bonds with a 4 1/4% coupon at a 4.303% high yield, a price of 99.104142.
The bid-to-cover ratio was 2.36.
Tenders at the high yield were allotted 67.88%.
The median yield was 4.230%. The low yield was 4.150%.
Tenders totaled $25,927,500,000 and the Treasury accepted $10,993,568,200, including $6,441,600 of noncompetitive.
Federal Reserve banks also bought $185,945,200 for their own account in exchange for maturing securities.
The bonds, dated July 15, will mature May 15, 2039.