Largest Scotch-Irish population, US counties · 2010
US counties ranked by the number of residents who are Scotch-Irish 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 66,233. 3,118 counties qualify in total. California carries 6 of the top 25 entries.
UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES
Frequently asked
Which county has the highest scotch-irish population?
Los Angeles County, California ranks #1 with 66,233 (2010 American Community Survey).
What are the top 5 counties by scotch-irish population?
Los Angeles County, California, Maricopa County, Arizona, Harris County, Texas, San Diego County, California, King County, Washington.
How many counties are in this ranking?
3,118 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 ACS 5-year data.
How is scotch-irish population measured?
Number of residents who are Scotch-Irish ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, American Community Survey 5-year estimates (2010).