Largest Scotch-Irish population, US counties
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. Maricopa County, Arizona leads at 26,736. 3,090 counties qualify in total. Texas carries 7 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?
Maricopa County, Arizona ranks #1 with 26,736 (2024 American Community Survey).
What are the top 5 counties by scotch-irish population?
Maricopa County, Arizona, Los Angeles County, California, Harris County, Texas, King County, Washington, San Diego County, California.
How many counties are in this ranking?
3,090 counties qualify after filtering for population minimums and data availability. The ranking covers 2024 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 (2024).