The map above shows Idaho and Indiana side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Indiana Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Indiana has 35,825 square miles (92,787 km²). Idaho's land area is 2.3 times (131%) larger than Indiana's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Indiana: 36,421 square miles (94,331 km²), including inland and coastal water. Idaho's total area is 2.3 times (129%) larger than Indiana's.
Length: Idaho is 483 miles (778 km) long from north to south; Indiana is 276 miles (444 km). Idaho's north-south length is 1.8 times (75%) longer than Indiana's.
Width: Idaho spans 352 miles (566 km) east to west; Indiana spans 193 miles (310 km). Idaho's east-west width is 1.8 times (82%) wider than Indiana's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Indiana's is Hoosier Hill at 1,255 feet (383 m). Borah Peak is 11,376 feet higher than Hoosier Hill.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Indiana's is Ohio River at 330 feet. Indiana's lowest point is 388 feet lower.
Idaho vs Indiana Population and History
Population: Idaho has a population of 2,001,619 (2024), while Indiana has 6,924,275 (2024). Indiana's population is 3.5 times (246%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Indiana: 193.3. Indiana's population density is 8.0 times (699%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Indiana's is Indianapolis with 891,484. Indianapolis' population is 3.7 times (275%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Indiana's Chicago-Naperville-Elgin, IL-IN metro area (9,408,576). Chicago-Naperville-Elgin, IL-IN metro area's population is 11.1 times larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Indiana: Admitted to the Union on December 11, 1816, as the 19th state. In its current form, Indiana is the older of the two by 74 years.
Idaho vs Indiana Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Indiana's $519.5 billion. Indiana's economic output is 4.0 times (303%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Indiana: $75,028. Indiana's GDP per capita is 1.2 times (16%) higher than Idaho's.
Average income: Idaho: $62,323 vs Indiana: $64,077 average income per person (per capita personal income). Idaho and Indiana have about the same average income.
Idaho vs Indiana Counties
Number of counties: Idaho has 44 counties, while Indiana has 92. Indiana's county count is 2.1 times (109%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Indiana's is Allen County at 657 square miles. Idaho County's land area is 12.9 times larger than Allen County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Indiana: Ohio County (86 sq mi). Payette County's land area is 4.7 times (372%) larger than Ohio County's.
Most populous county: Idaho: Ada County (535,799 people) vs Indiana: Marion County (981,628 people). Marion County's population is 1.8 times (83%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Indiana: Ohio County (5,996 people). Ohio County's population is 7.6 times (655%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Indiana: Hamilton County ($104,283). Blaine County's income is 1.9 times (94%) richer than Hamilton County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Indiana: Miami County ($44,940). Miami County's income is 1.5 times (52%) richer than Madison County's.
Idaho vs Indiana Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Indiana has a top income tax rate of 2.95%. Idaho's top rate is 2.35 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Indiana: 0.74% of home value per year. Indiana's rate is 0.31 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Indiana: 7%. Indiana's combined rate is 0.97 percentage points higher.
Official Websites
Idaho official website · Indiana official website
More Size Comparisons
All Idaho size comparisons · All Indiana 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.