Short Answer
Racial and ethnic diversity is one of the most closely watched demographic measures in the United States, shaping everything from political representation to school funding and business marketing. The U.S. Census Bureau’s Vintage 2025 population estimates, released in June 2026, provide the most recent official state-level data on race and Hispanic origin, covering the period from April 1, 2020 to July 1, 2025. These estimates update the detailed race and ethnicity breakdowns first captured in the 2020 Census and allow researchers, policymakers, and the public to see how the nation’s diversity is changing state by state. While the 2025 vintage does not publish a single national diversity index, the underlying data on six race groups and Hispanic origin make it possible to calculate diversity scores and compare states. The broad pattern remains clear: states in the South and West, especially Hawaii, California, Nevada, and Maryland, continue to lead the nation in racial and ethnic diversity, while northern New England and parts of Appalachia remain the least diverse.
FAQ
What is the most diverse state in the U.S. according to 2025 Census estimates?
The Vintage 2025 estimates do not publish a single diversity index, but based on the 2020 Census baseline and the updated population counts, Hawaii remains the most diverse state. Its population includes large shares of Asian, Native Hawaiian and Other Pacific Islander, White, and multiracial residents, with no single group forming a majority.
How does the Census Bureau measure racial and ethnic diversity?
The Census Bureau collects data on race and Hispanic origin separately. Race categories include White, Black or African American, American Indian/Alaska Native, Asian, Native Hawaiian/Other Pacific Islander, and Two or More Races. Hispanic origin is an ethnicity, not a race. The diversity index is calculated by summing the squared population shares of all race and ethnicity groups and subtracting from 1, giving the probability that two random people are from different groups.
Which states are the least diverse?
Maine, Vermont, and West Virginia consistently rank as the least diverse states. Their populations are overwhelmingly non-Hispanic White, resulting in diversity index values below 21% in the 2020 Census. The 2025 estimates show these states remain at the bottom of the diversity rankings.
Has the U.S. become more diverse over time?
Yes. The national diversity index rose from 54.9% in 2010 to 61.1% in 2020, and the Vintage 2025 estimates indicate continued diversification through 2025. Growth in Hispanic, Asian, and multiracial populations, along with immigration and domestic migration to the South and West, are the main drivers.
Why doesn't the 2025 release include a diversity index?
The Vintage 2025 state population estimates provide detailed counts by race and Hispanic origin, but the Census Bureau does not publish a single diversity index in that release. Researchers can calculate the index from the detailed tables, but many published rankings still use the 2020 Census diversity index as the most recent official single-number measure.
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