Largest Czech population, US counties · 2020
US counties ranked by the number of residents who are Czech ancestry, from the 2023 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. Cook County, Illinois leads at 36,238. 2,650 counties qualify in total. Texas carries 8 of the top 25 entries.
UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES
Frequently asked
Which county has the highest czech population?
Cook County, Illinois ranks #1 with 36,238 (2020 American Community Survey).
What are the top 5 counties by czech population?
Cook County, Illinois, Harris County, Texas, Douglas County, Nebraska, Maricopa County, Arizona, DuPage County, Illinois.
How many counties are in this ranking?
2,650 counties qualify after filtering for population minimums and data availability. The ranking covers 2020 ACS 5-year data.
How is czech population measured?
Number of residents who are Czech ancestry (Ancestry, ACS detailed tables). Source: US Census Bureau, American Community Survey 5-year estimates (2020).