The Illinois county that saw the largest population growth between the same time period was Champaign County, with a total increase of 1,502 residents.
The American Community Survey (ACS) is an ongoing survey by the U.S. Census Bureau. It regularly gathers information previously contained only in the long form of the decennial census, such as ancestry, citizenship, educational attainment, income, language proficiency, migration, disability, employment, and housing characteristics. These data are used by many public-sector, private-sector, and not-for-profit stakeholders to allocate funding, track shifting demographics, plan for emergencies, and learn about local communities.
Population according to ACS
| County | 2018 | 2017 | % change |
|---|---|---|---|
| St. Clair County | 263,463 | 264,433 | 0.4 |
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