Whites are now in the minority in one third of America's most populous counties and, overall, outnumbered in nearly one in 10 of the nation's 3,141 counties, according to new analysis of census data.
The shift reflects the increasing diversity of the US, the result of immigration particularly from Central and South America and the higher birth rate among blacks and Hispanics.
Numerically, the greatest increases were in New York, Los Angeles, Washington, San Francisco and Chicago.
Many of the nation's biggest counties have long had large minority populations.
But the data shows how diversity is spreading to the suburbs and beyond, as people move to take up jobs created by whites gravitating away from metropolitan centers.