The map above shows Illinois and Oregon side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Illinois vs Oregon Geography
Land area: Illinois has a land area of 55,513 square miles (143,778 km²), while Oregon has 95,997 square miles (248,630 km²). Oregon's land area is 1.7 times (73%) larger than Illinois'.
Total area: Illinois: 57,913 square miles (149,995 km²) vs Oregon: 98,379 square miles (254,799 km²), including inland and coastal water. Oregon's total area is 1.7 times (70%) larger than Illinois'.
Length: Illinois is 390 miles (628 km) long from north to south; Oregon is 453 miles (730 km). Oregon's north-south length is 1.2 times (16%) longer than Illinois'.
Width: Illinois spans 283 miles (456 km) east to west; Oregon spans 445 miles (715 km). Oregon's east-west width is 1.6 times (57%) wider than Illinois'.
Highest point: Illinois's highest point is Charles Mound at 1,232 feet (376 m); Oregon's is Mount Hood at 11,232 feet (3,424 m). Mount Hood is 10,000 feet higher than Charles Mound.
Lowest point: Illinois's lowest point is Mississippi River at 292 feet; Oregon's is Pacific Ocean at 0 feet. Oregon's lowest point is 292 feet lower.
Illinois vs Oregon Population and History
Population: Illinois has a population of 12,710,158 (2024), while Oregon has 4,272,371 (2024). Illinois' population is 3.0 times (197%) larger than Oregon's.
Population density: Illinois: 229.0 people per square mile vs Oregon: 44.5. Illinois' population density is 5.1 times (415%) higher than Oregon's.
Biggest city: Illinois's biggest city is Chicago with 2,721,308 people; Oregon's is Portland with 635,749. Chicago's population is 4.3 times (328%) larger than Portland's.
Largest metro area: Illinois's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Oregon's Portland-Vancouver-Hillsboro, OR-WA metro area (2,537,904). Chicago-Naperville-Elgin, IL-IN metro area's population is 3.7 times (271%) larger than Portland-Vancouver-Hillsboro, OR-WA metro area's.
History: Illinois: Admitted to the Union on December 3, 1818, as the 21st state. Oregon: Admitted to the Union on February 14, 1859, as the 33rd state. In its current form, Illinois is the older of the two by 41 years.
Illinois vs Oregon Economy
GDP: Illinois's GDP is $1,148.1 billion (2024) vs Oregon's $330.2 billion. Illinois' economic output is 3.5 times (248%) larger than Oregon's.
GDP per capita: Illinois: $90,330 per person vs Oregon: $77,299. Illinois' GDP per capita is 1.2 times (17%) higher than Oregon's.
Average income: Illinois: $74,522 vs Oregon: $70,823 average income per person (per capita personal income). Illinois' average income is 1.1 times (5%) higher than Oregon's.
Illinois vs Oregon Counties
Number of counties: Illinois has 102 counties, while Oregon has 36. Illinois' county count is 2.8 times (183%) higher than Oregon's.
Biggest county by area: Illinois's largest county is McLean County at 1,183 square miles; Oregon's is Harney County at 10,134 square miles. Harney County's land area is 8.6 times (757%) larger than McLean County's.
Smallest county by area: Illinois: Putnam County (160 sq mi) vs Oregon: Multnomah County (431 sq mi). Multnomah County's land area is 2.7 times (169%) larger than Putnam County's.
Most populous county: Illinois: Cook County (5,182,617 people) vs Oregon: Multnomah County (795,897 people). Cook County's population is 6.5 times (551%) larger than Multnomah County's.
Least populous county: Illinois: Hardin County (3,550 people) vs Oregon: Wheeler County (1,456 people). Hardin County's population is 2.4 times (144%) larger than Wheeler County's.
Richest county: Illinois: Cumberland County ($104,890 per capita income) vs Oregon: Deschutes County ($86,176). Cumberland County's income is 1.2 times (22%) richer than Deschutes County's.
Poorest county: Illinois: Lawrence County ($43,606 per capita income) vs Oregon: Malheur County ($42,974). Lawrence County and Malheur County have about the same income.
Illinois vs Oregon Taxes
State income tax: Illinois has a top income tax rate of 4.95%, while Oregon has a top income tax rate of 9.9%. Oregon's top rate is 4.95 percentage points higher.
Property tax: Illinois: 1.92% effective rate vs Oregon: 0.78% of home value per year. Illinois's rate is 1.14 percentage points higher.
Sales tax: Illinois: 8.98% combined state and average local rate vs Oregon: 0%. Illinois's combined rate is 8.98 percentage points higher.
Official Websites
Illinois official website · Oregon official website
More Size Comparisons
All Illinois size comparisons · All Oregon 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.