The map above shows Idaho and New South Wales side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs New South Wales Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while New South Wales has 309,130 square miles (800,642 km²). New South Wales' land area is 3.7 times (274%) larger than Idaho's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs New South Wales: 309,130 square miles (800,642 km²), including inland and coastal water. New South Wales' total area is 3.7 times (270%) larger than Idaho's.
Length: Idaho is 483 miles (778 km) long from north to south; New South Wales is 678 miles (1,092 km). New South Wales' north-south length is 1.4 times (40%) longer than Idaho's.
Width: Idaho spans 352 miles (566 km) east to west; New South Wales spans 831 miles (1,338 km). New South Wales' east-west width is 2.4 times (136%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); New South Wales's is Mount Kosciuszko at 7,310 feet (2,228 m). Borah Peak is 5,321 feet higher than Mount Kosciuszko.
Lowest point: Idaho's lowest point is Snake River at 718 feet; New South Wales's is Pacific Ocean at 0 feet. New South Wales's lowest point is 718 feet lower.
Idaho vs New South Wales Population and History
Population: Idaho has a population of 2,001,619 (2024), while New South Wales has 8,624,534 (2025). New South Wales' population is 4.3 times (331%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs New South Wales: 27.9. New South Wales' population density is 1.2 times (15%) higher than Idaho's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs New South Wales's Greater Sydney (5,638,830). Greater Sydney's population is 6.7 times (567%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. New South Wales: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1788. In its current form, Idaho is the older of the two by 11 years.
Idaho vs New South Wales Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs New South Wales's $547.1 billion. New South Wales' economic output is 4.2 times (324%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs New South Wales: $63,435. Idaho and New South Wales have about the same GDP per capita.
Official Websites
Idaho official website · New South Wales official website
More Size Comparisons
All Idaho size comparisons · All New South Wales 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.