The Wall Street Journal provides an accurate listing of preferred stock symbols, as well as the opening, closing, and other valuation information for each stock on a daily basis. The stocks are listed alphabetically according to the full name of the stock, not the symbol.
Dividend.com also offers a listing of preferred stock symbols; sort alphabetically by stock symbol or company name, or organize the list from highest to lowest dividend yield. This site also offers the option to export the list to an Excel document or other type of spreadsheet.
Information on preferred stock symbols is also provided on the Preferred Stock Channel, which includes a thorough listing of the S&P 500 preferred stocks.