"Approximately 11.7 million persons, representing 5% of all persons age 16 or older in the United States,1 were victims of one or more types of identity theft within a 2-year period (figure 1). The most common type of identity theft, experienced by 6.2 million people during the 2-year reporting period, was the unauthorized use of an existing credit card account. This report is based on data from the 2008 Identity Theft Supplement (ITS) to the National Crime Victimization Survey (NCVS). From January to June of 2008, the NCVS-ITS collected data from persons who had experienced one or more attempted or successful incidents of identity theft during the 2 years preceding their interviews."
Bureau of Justice Statistics: http://bjs.ojp.usdoj.gov/