The weekly average yield to maturity of The Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, fell three basis points to 4.15% from the previous week's 4.18%.
The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields was six basis points lower to 3.71% from 3.77% 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 six basis points to 3.22% from 3.28% in the previous week. It is at its lowest level since it was at 3.10% 24 weeks ago.
The Bond Buyer's Revenue Bond Index dropped four basis points to 3.91% from 3.95% last week. It is at its lowest level since Jan. 12, when it was at 3.83%.
The yield on the U.S. Treasury's 10-year note was unchanged from 2.24%, while the yield on the Treasury's 30-year bond was one basis point lower to 2.89% from 2.90% in the prior week.
