Largest American population, US counties · 2010
US counties ranked by the number of residents who are American ancestry, from the 2010 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. Los Angeles County, California leads at 207,551. 3,123 counties qualify in total. Florida carries 7 of the top 25 entries.
American ancestry: full group profile →UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS
Frequently asked
Which county has the highest american population?
Los Angeles County, California ranks #1 with 207,551 (2010 Decennial Census).
What are the top 5 counties by american population?
Los Angeles County, California, Maricopa County, Arizona, Harris County, Texas, Tarrant County, Texas, Dallas County, Texas.
How many counties are in this ranking?
3,123 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 Decennial Census data.
How is american population measured?
Number of residents who are American ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, 2010 Decennial Census.