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
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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.