The map above shows Idaho and Wyoming side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Wyoming Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Wyoming has 97,089 square miles (251,458 km²). Wyoming's land area is 1.2 times (17%) larger than Idaho's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Wyoming: 97,810 square miles (253,326 km²), including inland and coastal water. Wyoming's total area is 1.2 times (17%) larger than Idaho's.
Length: Idaho is 483 miles (778 km) long from north to south; Wyoming is 324 miles (522 km). Idaho's north-south length is 1.5 times (49%) longer than Wyoming's.
Width: Idaho spans 352 miles (566 km) east to west; Wyoming spans 410 miles (659 km). Wyoming's east-west width is 1.2 times (16%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Wyoming's is Gannett Peak at 13,788 feet (4,203 m). Gannett Peak is 1,157 feet higher than Borah Peak.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Wyoming's is Belle Fourche River at 3,108 feet. Idaho's lowest point is 2,390 feet lower.
Idaho vs Wyoming Population and History
Population: Idaho has a population of 2,001,619 (2024), while Wyoming has 587,618 (2024). Idaho's population is 3.4 times (241%) larger than Wyoming's.
Population density: Idaho: 24.2 people per square mile vs Wyoming: 6.1. Idaho's population density is 4.0 times (297%) higher than Wyoming's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Wyoming's is Cheyenne with 65,704. Boise's population is 3.6 times (262%) larger than Cheyenne's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Wyoming's Cheyenne, WY metro area (101,783). Boise City, ID metro area's population is 8.3 times (731%) larger than Cheyenne, WY metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Wyoming: Admitted to the Union on July 10, 1890, as the 44th state.
Idaho vs Wyoming Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Wyoming's $51.5 billion. Idaho's economic output is 2.5 times (150%) larger than Wyoming's.
GDP per capita: Idaho: $64,457 per person vs Wyoming: $87,639. Wyoming's GDP per capita is 1.4 times (36%) higher than Idaho's.
Average income: Idaho: $62,323 vs Wyoming: $86,477 average income per person (per capita personal income). Wyoming's average income is 1.4 times (39%) higher than Idaho's.
Idaho vs Wyoming Counties
Number of counties: Idaho has 44 counties, while Wyoming has 23. Idaho's county count is 1.9 times (91%) higher than Wyoming's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Wyoming's is Sweetwater County at 10,427 square miles. Sweetwater County's land area is 1.2 times (23%) larger than Idaho County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Wyoming: Hot Springs County (2,004 sq mi). Hot Springs County's land area is 4.9 times (393%) larger than Payette County's.
Most populous county: Idaho: Ada County (535,799 people) vs Wyoming: Laramie County (101,783 people). Ada County's population is 5.3 times (426%) larger than Laramie County's.
Least populous county: Idaho: Clark County (794 people) vs Wyoming: Niobrara County (2,301 people). Niobrara County's population is 2.9 times (190%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Wyoming: Teton County ($532,903). Teton County's income is 2.6 times (163%) richer than Blaine County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Wyoming: Uinta County ($50,370). Uinta County's income is 1.7 times (71%) richer than Madison County's.
Idaho vs Wyoming Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Wyoming has no state income tax. Idaho's top rate is 5.3 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Wyoming: 0.57% of home value per year. Wyoming's rate is 0.14 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Wyoming: 5.39%. Idaho's combined rate is 0.64 percentage points higher.
Official Websites
Idaho official website · Wyoming official website
More Size Comparisons
All Idaho size comparisons · All Wyoming 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.