The map above shows United States and Idaho side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
United States vs Idaho Geography
Land area: United States has a land area of 3,533,467 square miles (9,151,637 km²), while Idaho has 82,645 square miles (214,051 km²). United States' land area is 42.8 times larger than Idaho's.
Total area: United States: 3,802,784 square miles (9,849,165 km²) vs Idaho: 83,569 square miles (216,441 km²), including inland and coastal water. United States' total area is 45.5 times larger than Idaho's.
Length: United States is 3,628 miles (5,839 km) long from north to south; Idaho is 483 miles (778 km). United States' north-south length is 7.5 times (651%) longer than Idaho's.
Width: United States spans 4,824 miles (7,763 km) east to west; Idaho spans 352 miles (566 km). United States' east-west width is 13.7 times wider than Idaho's.
Highest point: United States's highest point is Denali at 20,308 feet (6,190 m); Idaho's is Borah Peak at 12,631 feet (3,850 m). Denali is 7,677 feet higher than Borah Peak.
Lowest point: United States's lowest point is Death Valley at -279 feet; Idaho's is Snake River at 718 feet. United States's lowest point is 997 feet lower.
United States vs Idaho Population and History
Population: United States has a population of 340,110,988 (2024), while Idaho has 2,001,619 (2024). United States' population is 169.9 times larger than Idaho's.
Population density: United States: 96.3 people per square mile vs Idaho: 24.2. United States' population density is 4.0 times (298%) higher than Idaho's.
Biggest city: United States's biggest city is New York with 8,478,072 people; Idaho's is Boise with 237,963. New York's population is 35.6 times larger than Boise's.
Largest metro area: United States's largest metropolitan area is New York-Newark-Jersey City, NY-NJ metro area (19,940,274 people) vs Idaho's Boise City, ID metro area (845,877). New York-Newark-Jersey City, NY-NJ metro area's population is 23.6 times larger than Boise City, ID metro area's.
History: United States: Declared independence on July 4, 1776. Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. In its current form, United States is the older of the two by 114 years.
United States vs Idaho Economy
GDP: United States's GDP is $30,769.7 billion (2025) vs Idaho's $129.0 billion. United States' economic output is 238.5 times larger than Idaho's.
GDP per capita: United States: $89,599 per person vs Idaho: $64,457. United States' GDP per capita is 1.4 times (39%) higher than Idaho's.
Official Websites
United States official website · Idaho official website
More Size Comparisons
All United States size comparisons · All Idaho 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.