The map above shows United States and Illinois side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
United States vs Illinois Geography
Land area
- United States has a land area of 3,533,467 square miles (9,151,637 km²), while Illinois has 55,513 square miles (143,778 km²).
- United States' land area is 63.7 times larger than Illinois'.
Total area
- United States: 3,802,784 square miles (9,849,165 km²) vs Illinois: 57,913 square miles (149,995 km²), including inland and coastal water.
- United States' total area is 65.7 times larger than Illinois'.
Length
- United States is 3,628 miles (5,839 km) long from north to south; Illinois is 390 miles (628 km).
- United States' north-south length is 9.3 times (830%) longer than Illinois'.
Width
- United States spans 4,824 miles (7,763 km) east to west; Illinois spans 283 miles (456 km).
- United States' east-west width is 17.0 times wider than Illinois'.
Highest point
- United States's highest point is Denali at 20,308 feet (6,190 m); Illinois's is Charles Mound at 1,232 feet (376 m).
- Denali is 19,076 feet higher than Charles Mound.
Lowest point
- United States's lowest point is Death Valley at -279 feet; Illinois's is Mississippi River at 292 feet.
- United States's lowest point is 571 feet lower.
United States vs Illinois Population and History
Population
- United States has a population of 340,110,988 (2024), while Illinois has 12,710,158 (2024).
- United States' population is 26.8 times larger than Illinois'.
Population density
- United States: 96.3 people per square mile vs Illinois: 229.0.
- Illinois' population density is 2.4 times (138%) higher than United States'.
Biggest city
- United States's biggest city is New York with 8,478,072 people; Illinois's is Chicago with 2,721,308.
- New York's population is 3.1 times (212%) larger than Chicago's.
Largest metro area
- United States's largest metropolitan area is New York-Newark-Jersey City, NY-NJ metro area (19,940,274 people) vs Illinois's Chicago-Naperville-Elgin, IL-IN metro area (9,408,576).
- New York-Newark-Jersey City, NY-NJ metro area's population is 2.1 times (112%) larger than Chicago-Naperville-Elgin, IL-IN metro area's.
History
- United States: Declared independence on July 4, 1776.
- Illinois: Admitted to the Union on December 3, 1818, as the 21st state.
- In its current form, United States is the older of the two by 42 years.
United States vs Illinois Economy
GDP
- United States's GDP is $30,769.7 billion (2025) vs Illinois's $1,148.1 billion.
- United States' economic output is 26.8 times larger than Illinois'.
GDP per capita
- United States: $89,599 per person vs Illinois: $90,330.
- United States and Illinois have about the same GDP per capita.
Official Websites
United States official website · Illinois official website
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More Size Comparisons
All United States size comparisons · All Illinois size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.