The exact number of date rape is not known since there is fear of inflated statistics in accounting for rape numbers in USA. Also according to a 2013 global review, 35 per cent of women worldwide have experienced either physical and/or sexual intimate partner violence or non-partner sexual violence and more often than not, cases of violence against women go unreported.
Date rape is a subset of acquaintance rape where nonconsensual sex occurs between two people who are in a romantic relationship. "Acquaintance rape also includes rapes in which the victim and perpetrator have been in a non-romantic, non-sexual relationship, for example as co-workers or neighbors. Date rape is particularly prevalent on college campuses, where it frequently occurs in situations involving alcohol or other date rape drugs, which may facilitate the execution of drug facilitated sexual assault DFSA".
Per CDC in 2010, the annual estimated number of completed alcohol/drug facilitated penetration rape victims is 780,000 out of estimated rape victims of 1,270,000. The life time estimated number of Completed alcohol/drug facilitated penetration rape victims is 9,524,000 out of estimated rape victims of 21,840,000 in USA. About 5% of women (5.2%) experienced attempted forced penetration, and 8.0% experienced alcohol/drug-facilitated completed forced penetration. One percent, or approximately 1.3 million women, reported some type of rape victimization in the 12 months prior to taking the survey.
Per CDC in 2013, the annual estimated number of rape victims in USA (Completed alcohol/drug facilitated penetration) is not reported since relative standard error > 30%. The life time estimated number of rape victims in USA (Completed alcohol/drug facilitated penetration) per CDC 2010 is 4,098,000 out of estimated rape victims of 11,162,000. Nearly 1 in 10 women in the United States (9.4%) has been raped by an intimate partner in her lifetime, including completed forced penetration, attempted forced penetration, or alcohol/drug facilitated completed penetration.
However, National Crime Victimization Survey by Bureau of Justice Statistics in 2013 quotes a different total annual rape victims number of 96970 (students 31302 and nonstudents 65668) where completed alcohol/drug facilitated penetration numbers are not exactly known since survey does not specifically ask about incidents in which the victim was unable to provide consent because of drug or alcohol consumption.