According to 2005 Census Bureau statistics, the male African-American population of the United States aged between 18 and 24 numbered 1,896,000. According to the Bureau of Justice Statistics, 106,000 African-Americans in this age group were in federal or state prisons at the end of 2005. See table 10 of this report. If you add the numbers in local jail (measured in mid-2006), you arrive at a grand total of 193,000 incarcerated young Black males, or slightly over 10 percent.
According to the same census data, 530,000 of these African-American males, or twenty eight percent, were enrolled in colleges or universities (including two-year-colleges) in 2005. That is five times the number of young black men in federal and state prisons and two and a half times the total number incarcerated. If you expanded the age group to include African-American males up to thirty or thirty five, the college attendees would still outnumber the prisoners.
Everybody acknowledges that incarceration rates among young black males are much higher than among whites or Hispanics. An August 2003 Bureau of Justice Statistics analysis shows that 32 percent of black males born in 2001 can expect to spend time in prison over the course of their lifetime. That is up from 13.4 percent in 1974 and 29.4 percent in 1991. By contrast, 17.2 percent of Hispanics and 5.9 percent of whites born in 2001 are likely to end up in prison.
http://voices.washingtonpost.com/fact-checker/2007/10/young_black_males_headed_for_e_1.html