The weekly average yield to maturity of The Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, fell to 3.98% from 4.02% last week.
The Bond Buyer's 20-Bond GO Index of 20-year general obligation yields fell eight basis points to 3.53% from 3.61% the prior week. It is at its lowest level since Sept. 7, when it was at 3.49%.
The 11-Bond GO Index of higher-grade 11-year GO was eight basis points lower to 3.04% from 3.12% the previous week. It is at its lowest level in seven weeks.
The Bond Buyer's Revenue Bond Index gained four basis points to 3.86% from 3.82% last week. It is at its highest level since May 25, when it was at 3.87%.
The yield on the U.S. Treasury's 10-year note was unchanged at 2.33% from the previous week, while the yield on the Treasury's 30-year was three basis points lower to 2.83% from 2.86% in the prior week.