The map above shows Illinois and Utah side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Illinois vs Utah Geography
Land area: Illinois has a land area of 55,513 square miles (143,778 km²), while Utah has 82,596 square miles (213,922 km²). Utah's land area is 1.5 times (49%) larger than Illinois'.
Total area: Illinois: 57,913 square miles (149,995 km²) vs Utah: 84,898 square miles (219,885 km²), including inland and coastal water. Utah's total area is 1.5 times (47%) larger than Illinois'.
Length: Illinois is 390 miles (628 km) long from north to south; Utah is 436 miles (702 km). Utah's north-south length is 1.1 times (12%) longer than Illinois'.
Width: Illinois spans 283 miles (456 km) east to west; Utah spans 268 miles (431 km). Illinois' east-west width is 1.1 times (6%) wider than Utah's.
Highest point: Illinois's highest point is Charles Mound at 1,232 feet (376 m); Utah's is Kings Peak at 13,512 feet (4,118 m). Kings Peak is 12,280 feet higher than Charles Mound.
Lowest point: Illinois's lowest point is Mississippi River at 292 feet; Utah's is Beaver Dam Wash at 2,180 feet. Illinois's lowest point is 1,888 feet lower.
Illinois vs Utah Population and History
Population: Illinois has a population of 12,710,158 (2024), while Utah has 3,503,613 (2024). Illinois' population is 3.6 times (263%) larger than Utah's.
Population density: Illinois: 229.0 people per square mile vs Utah: 42.4. Illinois' population density is 5.4 times (440%) higher than Utah's.
Biggest city: Illinois's biggest city is Chicago with 2,721,308 people; Utah's is Salt Lake City with 217,783. Chicago's population is 12.5 times larger than Salt Lake City's.
Largest metro area: Illinois's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Utah's Salt Lake City-Murray, UT metro area (1,300,762). Chicago-Naperville-Elgin, IL-IN metro area's population is 7.2 times (623%) larger than Salt Lake City-Murray, UT metro area's.
History: Illinois: Admitted to the Union on December 3, 1818, as the 21st state. Utah: Admitted to the Union on January 4, 1896, as the 45th state. In its current form, Illinois is the older of the two by 78 years.
Illinois vs Utah Economy
GDP: Illinois's GDP is $1,148.1 billion (2024) vs Utah's $299.5 billion. Illinois' economic output is 3.8 times (283%) larger than Utah's.
GDP per capita: Illinois: $90,330 per person vs Utah: $85,475. Illinois' GDP per capita is 1.1 times (6%) higher than Utah's.
Average income: Illinois: $74,522 vs Utah: $67,333 average income per person (per capita personal income). Illinois' average income is 1.1 times (11%) higher than Utah's.
Illinois vs Utah Counties
Number of counties: Illinois has 102 counties, while Utah has 29. Illinois' county count is 3.5 times (252%) higher than Utah's.
Biggest county by area: Illinois's largest county is McLean County at 1,183 square miles; Utah's is San Juan County at 7,824 square miles. San Juan County's land area is 6.6 times (561%) larger than McLean County's.
Smallest county by area: Illinois: Putnam County (160 sq mi) vs Utah: Davis County (325 sq mi). Davis County's land area is 2.0 times (103%) larger than Putnam County's.
Most populous county: Illinois: Cook County (5,182,617 people) vs Utah: Salt Lake County (1,216,274 people). Cook County's population is 4.3 times (326%) larger than Salt Lake County's.
Least populous county: Illinois: Hardin County (3,550 people) vs Utah: Daggett County (956 people). Hardin County's population is 3.7 times (271%) larger than Daggett County's.
Richest county: Illinois: Cumberland County ($104,890 per capita income) vs Utah: Summit County ($280,510). Summit County's income is 2.7 times (167%) richer than Cumberland County's.
Poorest county: Illinois: Lawrence County ($43,606 per capita income) vs Utah: Beaver County ($39,179). Lawrence County's income is 1.1 times (11%) richer than Beaver County's.
Illinois vs Utah Taxes
State income tax: Illinois has a top income tax rate of 4.95%, while Utah has a top income tax rate of 4.5%. Illinois's top rate is 0.45 percentage points higher.
Property tax: Illinois: 1.92% effective rate vs Utah: 0.49% of home value per year. Illinois's rate is 1.43 percentage points higher.
Sales tax: Illinois: 8.98% combined state and average local rate vs Utah: 7.42%. Illinois's combined rate is 1.56 percentage points higher.
Official Websites
Illinois official website · Utah official website
More Size Comparisons
All Illinois size comparisons · All Utah 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.