University of Illinois Urbana‑Champaign

Geographic Region: Census Tracts

Census tracts generally have a population between 1,200 and 8,000 people, with an optimum population of 4,000.

A census tract usually covers a contiguous area; however, the size of census tracts varies widely depending on population density. Census tract boundaries are drawn with the intention of being maintained over a long time so that statistical comparisons can be made from census to census.

Source of definition: U.S. Census Bureau, Geography Division

Illinois Census Tracts

IECAM does not present data by census tracts in its online database or Regional Reports. However, IECAM sometimes uses census tract data to make maps/charts or estimates for special purposes.

Additional Resources