The weekly average yield to maturity of The Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, fell to 4.23% from 4.28% last week.
The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields declined to 4.26% from 4.30% in the previous week. It is at its lowest level since Oct. 4 when it was at 4.24%.
The 11-bond GO Index of higher-grade 11-year GOs decreased to 3.76% from 3.79% in the previous week. It is at its lowest level since Oct. 4 when it was 3.71%.
The Bond Buyer's Revenue Bond Index dropped to 4.75% from 4.79% the week before. It is at its lowest level since Oct. 4, when it was also at 4.75%.
The yield on the U.S. Treasury's 10-year note fell to 3.07% from 3.11%, while the yield on the 30-year Treasury fell to 3.32% from 3.36%.