Least racially diverse, US counties · 2010
US counties with the lowest CensusEasy Diversity Score, where most residents share the same race or ethnicity (2023 ACS). Rock County, Nebraska leads at 1. 3,131 counties qualify in total. Kentucky carries 5 of the top 25 entries.
Flip the list · Most racially diverse, US counties →UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES
Frequently asked
Which county has the lowest diversity score?
Rock County, Nebraska ranks #1 with 1 (2010 American Community Survey).
What are the top 5 counties by diversity score?
Rock County, Nebraska, Liberty County, Montana, Hettinger County, North Dakota, Garfield County, Montana, Logan County, North Dakota.
How many counties are in this ranking?
3,131 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 ACS 5-year data.
How is diversity score measured?
CensusEasy Diversity Score (0 to 100): the chance that two random residents are of a different race or ethnicity, rescaled so 100 is a perfectly even split across all five groups. A Simpson diversity index over the five ACS race and ethnicity shares. Source: US Census Bureau, American Community Survey 5-year estimates (2010).