The map above shows Idaho and Japan side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Japan Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Japan has 140,752 square miles (364,546 km²). Japan's land area is 1.7 times (70%) larger than Idaho's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Japan: 145,937 square miles (377,975 km²), including inland and coastal water. Japan's total area is 1.7 times (75%) larger than Idaho's.
Length: Idaho is 483 miles (778 km) long from north to south; Japan is 1,557 miles (2,505 km). Japan's north-south length is 3.2 times (222%) longer than Idaho's.
Width: Idaho spans 352 miles (566 km) east to west; Japan spans 1,568 miles (2,524 km). Japan's east-west width is 4.5 times (345%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Japan's is Mount Fuji at 12,388 feet (3,776 m). Borah Peak is 243 feet higher than Mount Fuji.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Japan's is Hachirogata at -13 feet. Japan's lowest point is 731 feet lower.
Idaho vs Japan Population and History
Population: Idaho has a population of 2,001,619 (2024), while Japan has 122,680,000 (2026). Japan's population is 61.3 times larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Japan: 871.6. Japan's population density is 36.0 times higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Japan's is Tokyo with 13,515,271. Tokyo's population is 56.8 times larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Japan's Tokyo (33,412,512). Tokyo's population is 39.5 times larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Japan: An independent state for over two millennia; the current constitution dates from 1947. In its current form, Japan is the older of the two by 1,230 years.
Idaho vs Japan Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Japan's $4,435.2 billion. Japan's economic output is 34.4 times larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Japan: $35,951. Idaho's GDP per capita is 1.8 times (79%) higher than Japan's.
Average income: Idaho: $62,323 vs Japan: $38,340 average income per person (per capita personal income). Idaho's average income is 1.6 times (63%) higher than Japan's.
Official Websites
Idaho official website · Japan official website
More Size Comparisons
All Idaho size comparisons · All Japan 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.