The weekly average yield to maturity of The Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, fell four basis points to 4.07% from the previous week's 4.11%.
The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields was eight basis points lower to 3.61% from 3.69% in the prior week. It is at its lowest level since Nov. 10, when it was at 3.52%.
The 11-Bond GO Index of higher-grade 20-year GO yields decreased eight basis points to 3.12% from 3.20% in the previous week. It is at its lowest level since 30 weeks ago, when it was at 3.10%.
The Bond Buyer's Revenue Bond Index dropped eight basis points to 3.79% from 3.87% last week. It is at its lowest level since Nov. 10, when it was at 3.69%.
The yield on the U.S. Treasury's 10-year note was three basis points lower to 2.22% from 2.25%, while the yield on the Treasury's 30-year bond decreased five basis points to 2.87% from 2.92% in the prior week.