Using secondary market transaction-level data and primary market issuance data from the Municipal Rulemaking Standards Board and the BondBuyer, MuniTrack provides a unified view of secondary-market roundtrip transactions costs and primary-market issuance activity and pricing. The tracker is intended to support policymakers, market participants, and researchers by offering transparent, high-frequency indicators of the municipal bond market. We update the figures in Section 1 and 3 monthly and the figures in Section 2 and 4 quarterly, and provide downloadable CSV files, a methodology appendix, and a more complete PDF version of the tracker.