Largest American population, US counties · 2020
US counties ranked by the number of residents who are American ancestry, from the 2023 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 324,424. 3,130 counties qualify in total. Florida carries 9 of the top 25 entries.
UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES
Frequently asked
Which county has the highest american population?
Los Angeles County, California ranks #1 with 324,424 (2020 American Community Survey).
What are the top 5 counties by american population?
Los Angeles County, California, Harris County, Texas, Maricopa County, Arizona, Broward County, Florida, Orange County, California.
How many counties are in this ranking?
3,130 counties qualify after filtering for population minimums and data availability. The ranking covers 2020 ACS 5-year data.
How is american population measured?
Number of residents who are American ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, American Community Survey 5-year estimates (2020).