The map above shows Idaho and Kansas side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Kansas Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Kansas has 81,759 square miles (211,754 km²). Idaho and Kansas have about the same land area.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Kansas: 82,278 square miles (213,100 km²), including inland and coastal water. Idaho and Kansas have about the same total area.
Length: Idaho is 483 miles (778 km) long from north to south; Kansas is 207 miles (334 km). Idaho's north-south length is 2.3 times (133%) longer than Kansas'.
Width: Idaho spans 352 miles (566 km) east to west; Kansas spans 401 miles (645 km). Kansas' east-west width is 1.1 times (14%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Kansas's is Mount Sunflower at 4,040 feet (1,231 m). Borah Peak is 8,591 feet higher than Mount Sunflower.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Kansas's is Verdigris River at 679 feet. Kansas's lowest point is 39 feet lower.
Idaho vs Kansas Population and History
Population: Idaho has a population of 2,001,619 (2024), while Kansas has 2,970,606 (2024). Kansas' population is 1.5 times (48%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Kansas: 36.3. Kansas' population density is 1.5 times (50%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Kansas's is Wichita with 400,991. Wichita's population is 1.7 times (69%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Kansas's Kansas City, MO-KS metro area (2,253,579). Kansas City, MO-KS metro area's population is 2.7 times (166%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Kansas: Admitted to the Union on January 29, 1861, as the 34th state. In its current form, Kansas is the older of the two by 29 years.
Idaho vs Kansas Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Kansas's $230.5 billion. Kansas' economic output is 1.8 times (79%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Kansas: $77,601. Kansas' GDP per capita is 1.2 times (20%) higher than Idaho's.
Average income: Idaho: $62,323 vs Kansas: $65,856 average income per person (per capita personal income). Kansas' average income is 1.1 times (6%) higher than Idaho's.
Idaho vs Kansas Counties
Number of counties: Idaho has 44 counties, while Kansas has 105. Kansas' county count is 2.4 times (139%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Kansas's is Butler County at 1,430 square miles. Idaho County's land area is 5.9 times (493%) larger than Butler County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Kansas: Wyandotte County (152 sq mi). Payette County's land area is 2.7 times (168%) larger than Wyandotte County's.
Most populous county: Idaho: Ada County (535,799 people) vs Kansas: Johnson County (632,276 people). Johnson County's population is 1.2 times (18%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Kansas: Greeley County (1,152 people). Greeley County's population is 1.5 times (45%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Kansas: Greeley County ($134,780). Blaine County's income is 1.5 times (50%) richer than Greeley County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Kansas: Wyandotte County ($42,878). Wyandotte County's income is 1.5 times (45%) richer than Madison County's.
Idaho vs Kansas Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Kansas has a top income tax rate of 5.58%. Kansas's top rate is 0.28 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Kansas: 1.25% of home value per year. Kansas's rate is 0.82 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Kansas: 8.71%. Kansas's combined rate is 2.68 percentage points higher.
Official Websites
Idaho official website · Kansas official website
More Size Comparisons
All Idaho size comparisons · All Kansas 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.