Illinois Population, Area, and Density
The population of Illinois is 12,880,580 people based on the U.S. Census Bureau's 2014 estimate. Illinois is ranked number 5 out of 56 U.S. States and Territories in terms of highest population. This is 123.5% above the national average of 5,763,868 people.
The total area in Illinois is 57,913.4 square miles. There state is 95.9% land and 4.1% water. The population density in Illinois is 232.0 people per square mile (18th out of 56).
Population Density CalculationPopulation Density = Total Population ÷ Total Land Area
Population Density = 12,880,580 people ÷ 55,518.8 sq mi
Population Density = 232.0 people per sq mile
|Population||12,880,580 (5th out of 56)||12,830,632 (5th out of 56)||12,419,293 (5th out of 56)|
|Difference||123.5% above avg||129.7% above avg||143.5% above avg|
|Total Area||57,913.4 mi2||149,995 km2||37,064,514 acres||(25th out of 56)|
|Land Area||55,518.8 mi2||143,793 km2||35,531,969 acres||(95.9%)|
|Water Area||2,394.6 mi2||6,202 km2||1,532,545 acres||(4.1%)|
|National Average||4,821.4 mi2||12,487 km2||3,085,666 acres|
|Density (people per sq mi)||232.0 (18th out of 56)||231.1 (18th out of 56)||223.7 (17th out of 56)|
|Average (people per sq mi)||434.9||415.6||398.2|
|Difference||46.6% below avg||44.4% below avg||43.8% below avg|