The map above shows Idaho and United Kingdom side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs United Kingdom Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while United Kingdom has 93,410 square miles (241,930 km²). United Kingdom's land area is 1.1 times (13%) larger than Idaho's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs United Kingdom: 94,058 square miles (243,610 km²), including inland and coastal water. United Kingdom's total area is 1.1 times (13%) larger than Idaho's.
Length: Idaho is 483 miles (778 km) long from north to south; United Kingdom is 747 miles (1,202 km). United Kingdom's north-south length is 1.5 times (55%) longer than Idaho's.
Width: Idaho spans 352 miles (566 km) east to west; United Kingdom spans 429 miles (690 km). United Kingdom's east-west width is 1.2 times (22%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); United Kingdom's is Ben Nevis at 4,413 feet (1,345 m). Borah Peak is 8,218 feet higher than Ben Nevis.
Lowest point: Idaho's lowest point is Snake River at 718 feet; United Kingdom's is The Fens (Holme Fen) at -10 feet. United Kingdom's lowest point is 728 feet lower.
Idaho vs United Kingdom Population and History
Population: Idaho has a population of 2,001,619 (2024), while United Kingdom has 69,487,000 (2025). United Kingdom's population is 34.7 times larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs United Kingdom: 743.9. United Kingdom's population density is 30.7 times higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; United Kingdom's is London with 8,825,001. London's population is 37.1 times larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs United Kingdom's London (10,416,420). London's population is 12.3 times larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. United Kingdom: Formed as the United Kingdom of Great Britain and Ireland on January 1, 1801; took its current form in 1922. In its current form, United Kingdom is the older of the two by 89 years.
Idaho vs United Kingdom Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs United Kingdom's $4,002.6 billion. United Kingdom's economic output is 31.0 times larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs United Kingdom: $57,602. Idaho's GDP per capita is 1.1 times (12%) higher than United Kingdom's.
Average income: Idaho: $62,323 vs United Kingdom: $54,550 average income per person (per capita personal income). Idaho's average income is 1.1 times (14%) higher than United Kingdom's.
Official Websites
Idaho official website · United Kingdom official website
More Size Comparisons
All Idaho size comparisons · All United Kingdom 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.