Financial portals such as Investing.com, business news companies such as CNBC, and non-profit, regulatory organizations such as FINRA track bond rates over time, as of March 2015. Each site specializes in its own bond markets, offers unique data search options and shows results in a different way.
Serving as an information-filled site for fresh, fixed-income market investors, Investing.com focuses on government-issued bonds worldwide, with an option to display historical bond rate data on a daily, weekly or monthly basis. CNBC lists rates for U.S. Treasuries and global government bonds and offers historical data chart with 5-day to 5-year intervals. In addition to municipal bond rates and Treasuries, FINRA also tracks corporate, securitized and 144A products.