Largest Slovak population, US counties · 2020
US counties ranked by the number of residents who are Slovak ancestry, from the 2023 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. Allegheny County, Pennsylvania leads at 40,190. 1,804 counties qualify in total. Pennsylvania carries 11 of the top 25 entries.
UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES
Frequently asked
Which county has the highest slovak population?
Allegheny County, Pennsylvania ranks #1 with 40,190 (2020 American Community Survey).
What are the top 5 counties by slovak population?
Allegheny County, Pennsylvania, Cuyahoga County, Ohio, Westmoreland County, Pennsylvania, Luzerne County, Pennsylvania, Mahoning County, Ohio.
How many counties are in this ranking?
1,804 counties qualify after filtering for population minimums and data availability. The ranking covers 2020 ACS 5-year data.
How is slovak population measured?
Number of residents who are Slovak ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, American Community Survey 5-year estimates (2020).