Overall, 69 counties were majority Hispanic in 2018, 72 were majority black and 10 were majority American Indian or Alaska Native. The majority American Indian or Alaska Native counties are unique in that most have experienced overall population declines since 2000, even as the share of American Indian or Alaska Native residents in these counties remained fairly flat.
There were no U.S. counties where Asians accounted for more than half of the population, but in Honolulu County, Hawaii, the population was 42% Asian and 9% Native Hawaiian or Pacific Islander.
The South and Southwest of the United States hold most of the counties where Hispanic, black or indigenous people make up a majority of residents. These counties represent just 5% of the 3,142 counties in the U.S. and about half of the country’s 293 majority nonwhite counties (a figure that includes counties where multiple racial and ethnic groups combine to account for a majority).
The number of majority Hispanic counties doubled between 2000 and 2018, from 34 to 69 – mostly in the South and West. In all but four of these 69 counties, the Hispanic share of the population grew during that period. The few counties that experienced declines saw only slight decreases, and no county that was majority Hispanic in 2000 fell below 50% Hispanic by 2018.
These trends are in line with the growth of the U.S. Hispanic population as a whole, which reached a new high in 2018 even as its rate of growth slowed. The Latino population grew at a faster rate than most other racial or ethnic groups during the 2000s, due to relatively high birth rates among Hispanic women and immigration from Latin America.
Related: See Pew Research Center’s U.S. population projections through 2065, which provide a look at immigration’s impact on population growth and on racial and ethnic change.
In 2018, Texas was home to the 10 counties in the U.S. with the largest shares of Hispanic residents. Starr County, home to about 65,000 people overall, had the largest concentration of Hispanic residents, at 96% of the population. Other counties where Hispanics accounted for an especially large share of residents included Webb (95%), Hidalgo (92%) and Cameron counties (90%) – all in Texas.
The Hispanic populations of some larger U.S. counties also grew between 2000 and 2018. San Bernardino County, California (population 2.2 million) was the most populous county to become majority Hispanic during this span. Osceola County, Florida (home to about 370,000) saw the largest percentage point increase in Hispanic residents during this time (26 points, rising from 29% to 55%).
The migrating U.S. black population
While the black share of the total U.S. population has not changed substantially over the last two decades, the number of majority black counties in the U.S. grew from 65 to 72 between 2000 and 2018. One contributing factor may be migration of black Americans from the North to the South and from cities into suburbs.
There are now 15 majority black counties that were not majority black in 2000. Among them, Rockdale County, Georgia, located about half an hour outside Atlanta, had the largest percentage point increase in the share of black residents (from 18% in 2000 to 55% in 2018). With about 930,000 residents, Shelby County, Tennessee, which contains Memphis, was the county with the largest population to become majority black.
The 10 counties with the highest shares of black residents in 2018 were in Mississippi (seven counties) Alabama (two) and Virginia (one). In these 10 counties, about 70% or more residents were black.
Meanwhile, eight counties that were majority black in 2000 are no longer. Three of these are large U.S. cities that the Census Bureau includes in its county estimates: Washington, D.C.; Richmond, Virginia; and St. Louis, Missouri. Washington (home to roughly 702,000 residents in 2018) saw a 19% increase in total population during that period, while its black population decreased by 9%. The city’s share of black residents declined by 15 percentage points, from 60% to 45%.
Majority American Indian or Alaska Native counties
In 2018, there were eight U.S. counties where more than half of the population was American Indian; two other counties were majority Alaska Native.
While majority Hispanic and black counties are growing in number, these predominantly American Indian or Alaska Native counties have experienced net population loss from 2000 to 2018. And one county that was majority American Indian or Alaska Native in 2000 is no longer: San Juan County, Utah, where the share of American Indian residents fell 8 percentage points, from 55% to 47%.
All 10 majority American Indian counties are located on or near reservation land in the Midwest and the West, and most have populations of fewer than 20,000 people. The exceptions are McKinley County, New Mexico, and Apache County, Arizona, both of which are home to about 72,000 people.
The two counties where the majority of residents were Alaska Native are both in rural Alaska: Bethel Census Area (population of roughly 18,000) and Nome Census Area (population of about 10,000).
Katherine Schaeffer is a research assistant at Pew Research Center.