The weekly average yield to maturity of The Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, fell to 4.15% from 4.21% the week before.
The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields declined to 4.12% from 4.22% in the previous week. It is at its lowest level since Sept. 13, when it was at 4.06%.
The 11-bond GO Index of higher-grade 11-year GOs decreased to 3.63% from 3.73% in the previous week. It is at its lowest level since Sept. 20, when it was 3.62%.
The Bond Buyer's Revenue Bond Index dropped to 4.58% from 4.68% the week before. It is at its lowest level since Sept. 13, when it was also at 4.57%.
The yield on the U.S. Treasury's 10-year note fell to 2.88% from 3.03%, while the yield on the 30-year Treasury dropped to 3.14% from 3.33%.