Mergent BondViewer (in Mergent Online) contains a wide-range of bond data, involving both issuer and issue-level terms and conditions for U.S. taxable bonds, municipal bonds and retail notes.
Other Sources
The following sources listed below are useful if you only need current information:
Includes statistics on Canadian treasury bill yields, Government of Canada bond yields, money market yields, and other key interest rates. Historical time series data is available in the CANSIM database from Statistics Canada. Follow this link to see available Bank of Canada data in CANSIM
Look up composite bond rates for US Treasury Bonds, Municipal Bonds, and Corporate Bonds. The Bond Screener lets you search for US bonds by bond type, maturity, and rating.
DBRS is a global credit rating agency. It covers corporate finance, financial institutions, public finance, sovereigns, and structured finance. Access to most content requires registration.