By the CNN Wire Staff
(CNN) - The number of interracial couples in the United States has reached an all-time high, with one in every 10 American opposite-sex married couples saying they're of mixed races, according to the most recent Census data released Wednesday.
In 2000, that figure was about 7%.
The rate of interracial partnerships also is much higher among the unmarried, the 2010 Census showed.
About 18% of opposite-sex unmarried couples and 21% of same-sex unmarried partners identify themselves as interracial.
The term interracial, as it pertains to the study, is defined as members of a couple identifying as of different races or ethnicities.
Analysts suggest the new figures could reflect U.S. population shifts, broader social acceptance of such unions and a more widespread willingness among those polled to be classified as mixed race.