Sangyoub Park sent us a link to a post by the Brookings Institution about the changing racial/ethnic demographics of the 100 largest metro areas in the U.S. While White non-Hispanics still make up the majority in those areas (at 57% of the population), the minority population has grown rapidly in a number of cities; 22 of the top 100 metro areas are now majority-minority:

A detailed map of the majority-minority metro areas, with the largest racial/ethnic minority group in each (and the White non-Hispanic population in parentheses):

This demographic shift in metro areas should accelerate, given the racial/ethnic makeup of the population of children under age 1:

The Washington Post has an interactive map that lets you select an area and get detailed demographic information at the Census tract level (racial/ethnic makeup, household type, etc.) from 1990 to 2010.

Of course, as Sangyoub points out, being in the numerical majority doesn’t imply that a group no longer meets the definition of a minority group in a social sense. In many areas, racial/ethnic minorities continue to have less access to or control over economic resources, social prestige, and political power than do non-Hispanic Whites. Accumulated advantages do not get automatically redistributed when demographics change.