The number of Americans who identify themselves as multi-racial grew faster than those who self-identify as a single-race during the last decade, a newly released US agency data from the 2010 Census has show.

According to the figures, the population reporting multiple races (9. 0 million) grew by 32.0 per cent from 2000 to 2010, compared with those who reported a single race, which grew by 9.2 per cent, the US Census Bureau said.

The total US population has increased by 9.7 per cent since 2000, but many multiple-race groups increased by 50 per cent or more.

For the first time in US history people were presented with the option to self-identify with more than one race came on the 2000 Census questionnaire.

“These comparisons show substantial growth in the multiple-race population, providing detailed insights to how this population has grown and diversified over the past decade,” said Nicholas Jones, chief of the US Census Bureau’s Racial Statistics Branch.

Four groups were the largest multiple-race combinations, each exceeding one million people in size, white and black (1.8 million), white and “some other race” (1.7 million), white and Asian (1.6 million) and white and American Indian and Alaska Native (1.4 million).

Since 2000, two multiple-race groups exhibited the most significant changes — the white and black population, which grew more than 1 million and increased by 134 per cent; and the white and Asian population, which grew by about 750,000 and increased by 87 per cent, the Census Bureau said.

According to the report, there were 16 states where the people who reported more than one race exceeded 200,000 or more.

The top three states (California, Texas and New York) each had a multiple-race population of half a million people or more.

The percentage change in the multiple-race population was 70 per cent or greater in nine states — South Carolina, North Carolina, Delaware, Georgia, Kentucky, Tennessee, West Virginia, Mississippi and South Dakota.

Each state, with the exception of South Dakota, was a southern state. The multiple-race population grew by 50 per cent or more in 22 additional states.

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