States101
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 Calculation
Population Density = Total Population ÷ Total Land AreaPopulation Density = 12,880,580 people ÷ 55,518.8 sq mi
Population Density = 232.0 people per sq mile
Population
| 2014 | 2010 | 2000 | |
|---|---|---|---|
| Population | 12,880,580 (5th out of 56) | 12,830,632 (5th out of 56) | 12,419,293 (5th out of 56) |
| National Average | 5,763,868 | 5,586,545 | 5,100,365 |
| Difference | 123.5% above avg | 129.7% above avg | 143.5% above avg |
Area
| Miles2 | Kilometers2 | Acres | ||
|---|---|---|---|---|
| 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 |
Population Density
| 2014 | 2010 | 2000 | |
|---|---|---|---|
| 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 |