Element Definition
Population density is defined as the number of people per unit area, calculated from population counts divided by land area. For this element, population density is derived from the most recent decennial census population data and is expressed as persons per unit area using standardized census geography. The element represents population distribution at the resolution of the source census units and does not represent individual residences or structures.
Mapped Feature Description
This element is displayed as a continuous raster or graduated surface representing population density across Illinois. Values are calculated from census population counts aggregated to the source geographic units and normalized by land area. The map does not depict population growth trends, demographic characteristics, daytime population, or transient populations beyond the census-based residential population.
Source: ACS Population and Housing Basics – Boundaries
Suitability Classifications
See how to use suitability classifications.
| Classification | Criteria (Persons per Square Mile) |
|---|---|
| Less Suitable | N/A |
| Suitable | >5000 |
| More Suitable | 250-5000 |
| Most Suitable | 0-250 |
| More Information Needed | N/A |