The map above shows Illinois and Wyoming side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Illinois vs Wyoming Geography
Land area: Illinois has a land area of 55,513 square miles (143,778 km²), while Wyoming has 97,089 square miles (251,458 km²). Wyoming's land area is 1.7 times (75%) larger than Illinois'.
Total area: Illinois: 57,913 square miles (149,995 km²) vs Wyoming: 97,810 square miles (253,326 km²), including inland and coastal water. Wyoming's total area is 1.7 times (69%) larger than Illinois'.
Length: Illinois is 390 miles (628 km) long from north to south; Wyoming is 324 miles (522 km). Illinois' north-south length is 1.2 times (20%) longer than Wyoming's.
Width: Illinois spans 283 miles (456 km) east to west; Wyoming spans 410 miles (659 km). Wyoming's east-west width is 1.4 times (45%) wider than Illinois'.
Highest point: Illinois's highest point is Charles Mound at 1,232 feet (376 m); Wyoming's is Gannett Peak at 13,788 feet (4,203 m). Gannett Peak is 12,556 feet higher than Charles Mound.
Lowest point: Illinois's lowest point is Mississippi River at 292 feet; Wyoming's is Belle Fourche River at 3,108 feet. Illinois's lowest point is 2,816 feet lower.
Illinois vs Wyoming Population and History
Population: Illinois has a population of 12,710,158 (2024), while Wyoming has 587,618 (2024). Illinois' population is 21.6 times larger than Wyoming's.
Population density: Illinois: 229.0 people per square mile vs Wyoming: 6.1. Illinois' population density is 37.5 times higher than Wyoming's.
Biggest city: Illinois's biggest city is Chicago with 2,721,308 people; Wyoming's is Cheyenne with 65,704. Chicago's population is 41.4 times larger than Cheyenne's.
Largest metro area: Illinois's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Wyoming's Cheyenne, WY metro area (101,783). Chicago-Naperville-Elgin, IL-IN metro area's population is 92.4 times larger than Cheyenne, WY metro area's.
History: Illinois: Admitted to the Union on December 3, 1818, as the 21st state. Wyoming: Admitted to the Union on July 10, 1890, as the 44th state. In its current form, Illinois is the older of the two by 72 years.
Illinois vs Wyoming Economy
GDP: Illinois's GDP is $1,148.1 billion (2024) vs Wyoming's $51.5 billion. Illinois' economic output is 22.3 times larger than Wyoming's.
GDP per capita: Illinois: $90,330 per person vs Wyoming: $87,639. Illinois and Wyoming have about the same GDP per capita.
Average income: Illinois: $74,522 vs Wyoming: $86,477 average income per person (per capita personal income). Wyoming's average income is 1.2 times (16%) higher than Illinois'.
Illinois vs Wyoming Counties
Number of counties: Illinois has 102 counties, while Wyoming has 23. Illinois' county count is 4.4 times (343%) higher than Wyoming's.
Biggest county by area: Illinois's largest county is McLean County at 1,183 square miles; Wyoming's is Sweetwater County at 10,427 square miles. Sweetwater County's land area is 8.8 times (781%) larger than McLean County's.
Smallest county by area: Illinois: Putnam County (160 sq mi) vs Wyoming: Hot Springs County (2,004 sq mi). Hot Springs County's land area is 12.5 times larger than Putnam County's.
Most populous county: Illinois: Cook County (5,182,617 people) vs Wyoming: Laramie County (101,783 people). Cook County's population is 50.9 times larger than Laramie County's.
Least populous county: Illinois: Hardin County (3,550 people) vs Wyoming: Niobrara County (2,301 people). Hardin County's population is 1.5 times (54%) larger than Niobrara County's.
Richest county: Illinois: Cumberland County ($104,890 per capita income) vs Wyoming: Teton County ($532,903). Teton County's income is 5.1 times (408%) richer than Cumberland County's.
Poorest county: Illinois: Lawrence County ($43,606 per capita income) vs Wyoming: Uinta County ($50,370). Uinta County's income is 1.2 times (16%) richer than Lawrence County's.
Illinois vs Wyoming Taxes
State income tax: Illinois has a top income tax rate of 4.95%, while Wyoming has no state income tax. Illinois's top rate is 4.95 percentage points higher.
Property tax: Illinois: 1.92% effective rate vs Wyoming: 0.57% of home value per year. Illinois's rate is 1.35 percentage points higher.
Sales tax: Illinois: 8.98% combined state and average local rate vs Wyoming: 5.39%. Illinois's combined rate is 3.59 percentage points higher.
Official Websites
Illinois official website · Wyoming official website
More Size Comparisons
All Illinois size comparisons · All Wyoming 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.