New data finds that the Asian population in the U.S. has tripled over the past 30 years to stand near 20 million.

The New York Times published its report last Saturday based on last year’s census data, adding that Asians are now the fastest-growing of the four largest racial and ethnic groups. The demographic has also become geographically diverse.

Back in 1990, the Asian population in the U.S. stood at six-point-six million and was largely concentrated in coastal areas but 30 years later, the population has spread out more, with many living in the suburbs of the South and in rural areas of the Midwest. 

The report said the Census Bureau defines Asians as people who trace their roots to more than 20 countries in East Asia, Southeast Asia and the Indian subcontinent.

Some one-point-five million people of South Korean descent were estimated to be residing in the U.S. and the median income of these households was around 74-thousand-320 dollars.