Recent bond ratings for the 50 state governments and the city governments of most of the largest cities in the U.S. may be found on the Statistical Abstract of the United States (1990-2012). The latest edition of the Statistical Abstract of the United States is available in the Buley Library Reference section.
Daily bond prices (as well as information on some historical transactions) and bond ratings from all three major rating agencies for municipal, government, and corporate bonds may be found by using the Bonds - Advanced Search on the Market Data Center of FINRA, the Financial Industry Regulatory Authority.
You can also search the Electronic Municipal Market Access (EMMA) website for ratings of municipal securities from Fitch and S&P. For Moody's ratings, search MunicipalBonds.com.
Much more detail is available in the MSRB Fact Book from the Municipal Securities Rulemaking Board.
