Nine percent of Hawaii households are multigenerational, the highest percentage in the nation, according to a report released by the U.S. Census Bureau today.

The bureau defines a multigenerational household as containing three or more parent-child generations.

Nationally, the number increased to 5.1 million in 2010, up from 3.9 million in 2000.

The report, titled "Households and Families: 2010," showed that what it calls interracial or interethnic opposite-sex married couple households grew by 28 percent over the decade, to 10 percent in 2010 from 7 percent in 2000.

States with higher percentages of mixed-race couples are primarily in the western and southwestern United States, including Hawaii and Alaska.