The map above shows Idaho and Oregon side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Oregon Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Oregon has 95,997 square miles (248,630 km²). Oregon's land area is 1.2 times (16%) larger than Idaho's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Oregon: 98,379 square miles (254,799 km²), including inland and coastal water. Oregon's total area is 1.2 times (18%) larger than Idaho's.
Length: Idaho is 483 miles (778 km) long from north to south; Oregon is 453 miles (730 km). Idaho's north-south length is 1.1 times (7%) longer than Oregon's.
Width: Idaho spans 352 miles (566 km) east to west; Oregon spans 445 miles (715 km). Oregon's east-west width is 1.3 times (26%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Oregon's is Mount Hood at 11,232 feet (3,424 m). Borah Peak is 1,399 feet higher than Mount Hood.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Oregon's is Pacific Ocean at 0 feet. Oregon's lowest point is 718 feet lower.
Idaho vs Oregon Population and History
Population: Idaho has a population of 2,001,619 (2024), while Oregon has 4,272,371 (2024). Oregon's population is 2.1 times (113%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Oregon: 44.5. Oregon's population density is 1.8 times (84%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Oregon's is Portland with 635,749. Portland's population is 2.7 times (167%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Oregon's Portland-Vancouver-Hillsboro, OR-WA metro area (2,537,904). Portland-Vancouver-Hillsboro, OR-WA metro area's population is 3.0 times (200%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Oregon: Admitted to the Union on February 14, 1859, as the 33rd state. In its current form, Oregon is the older of the two by 31 years.
Idaho vs Oregon Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Oregon's $330.2 billion. Oregon's economic output is 2.6 times (156%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Oregon: $77,299. Oregon's GDP per capita is 1.2 times (20%) higher than Idaho's.
Average income: Idaho: $62,323 vs Oregon: $70,823 average income per person (per capita personal income). Oregon's average income is 1.1 times (14%) higher than Idaho's.
Idaho vs Oregon Counties
Number of counties: Idaho has 44 counties, while Oregon has 36. Idaho's county count is 1.2 times (22%) higher than Oregon's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Oregon's is Harney County at 10,134 square miles. Harney County's land area is 1.2 times (20%) larger than Idaho County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Oregon: Multnomah County (431 sq mi). Multnomah County's land area is 1.1 times (6%) larger than Payette County's.
Most populous county: Idaho: Ada County (535,799 people) vs Oregon: Multnomah County (795,897 people). Multnomah County's population is 1.5 times (49%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Oregon: Wheeler County (1,456 people). Wheeler County's population is 1.8 times (83%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Oregon: Deschutes County ($86,176). Blaine County's income is 2.4 times (135%) richer than Deschutes County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Oregon: Malheur County ($42,974). Malheur County's income is 1.5 times (46%) richer than Madison County's.
Idaho vs Oregon Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Oregon has a top income tax rate of 9.9%. Oregon's top rate is 4.6 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Oregon: 0.78% of home value per year. Oregon's rate is 0.35 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Oregon: 0%. Idaho's combined rate is 6.03 percentage points higher.
Official Websites
Idaho official website · Oregon official website
More Size Comparisons
All Idaho 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.