The map above shows Indiana and Montana side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Indiana vs Montana Geography
Land area: Indiana has a land area of 35,825 square miles (92,787 km²), while Montana has 145,550 square miles (376,973 km²). Montana's land area is 4.1 times (306%) larger than Indiana's.
Total area: Indiana: 36,421 square miles (94,331 km²) vs Montana: 147,043 square miles (380,840 km²), including inland and coastal water. Montana's total area is 4.0 times (304%) larger than Indiana's.
Length: Indiana is 276 miles (444 km) long from north to south; Montana is 319 miles (514 km). Montana's north-south length is 1.2 times (16%) longer than Indiana's.
Width: Indiana spans 193 miles (310 km) east to west; Montana spans 607 miles (976 km). Montana's east-west width is 3.1 times (215%) wider than Indiana's.
Highest point: Indiana's highest point is Hoosier Hill at 1,255 feet (383 m); Montana's is Granite Peak at 12,767 feet (3,891 m). Granite Peak is 11,512 feet higher than Hoosier Hill.
Lowest point: Indiana's lowest point is Ohio River at 330 feet; Montana's is Kootenai River at 1,805 feet. Indiana's lowest point is 1,475 feet lower.
Indiana vs Montana Population and History
Population: Indiana has a population of 6,924,275 (2024), while Montana has 1,137,233 (2024). Indiana's population is 6.1 times (509%) larger than Montana's.
Population density: Indiana: 193.3 people per square mile vs Montana: 7.8. Indiana's population density is 24.8 times higher than Montana's.
Biggest city: Indiana's biggest city is Indianapolis with 891,484 people; Montana's is Billings with 121,483. Indianapolis' population is 7.3 times (634%) larger than Billings'.
Largest metro area: Indiana's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Montana's Billings, MT metro area (192,531). Chicago-Naperville-Elgin, IL-IN metro area's population is 48.9 times larger than Billings, MT metro area's.
History: Indiana: Admitted to the Union on December 11, 1816, as the 19th state. Montana: Admitted to the Union on November 8, 1889, as the 41st state. In its current form, Indiana is the older of the two by 73 years.
Indiana vs Montana Economy
GDP: Indiana's GDP is $519.5 billion (2024) vs Montana's $78.4 billion. Indiana's economic output is 6.6 times (563%) larger than Montana's.
GDP per capita: Indiana: $75,028 per person vs Montana: $68,975. Indiana's GDP per capita is 1.1 times (9%) higher than Montana's.
Average income: Indiana: $64,077 vs Montana: $69,240 average income per person (per capita personal income). Montana's average income is 1.1 times (8%) higher than Indiana's.
Indiana vs Montana Counties
Number of counties: Indiana has 92 counties, while Montana has 56. Indiana's county count is 1.6 times (64%) higher than Montana's.
Biggest county by area: Indiana's largest county is Allen County at 657 square miles; Montana's is Beaverhead County at 5,543 square miles. Beaverhead County's land area is 8.4 times (744%) larger than Allen County's.
Smallest county by area: Indiana: Ohio County (86 sq mi) vs Montana: Silver Bow County (718 sq mi). Silver Bow County's land area is 8.3 times (733%) larger than Ohio County's.
Most populous county: Indiana: Marion County (981,628 people) vs Montana: Yellowstone County (171,583 people). Marion County's population is 5.7 times (472%) larger than Yellowstone County's.
Least populous county: Indiana: Ohio County (5,996 people) vs Montana: Petroleum County (525 people). Ohio County's population is 11.4 times larger than Petroleum County's.
Richest county: Indiana: Hamilton County ($104,283 per capita income) vs Montana: Gallatin County ($94,573). Hamilton County's income is 1.1 times (10%) richer than Gallatin County's.
Poorest county: Indiana: Miami County ($44,940 per capita income) vs Montana: Blaine County ($37,554). Miami County's income is 1.2 times (20%) richer than Blaine County's.
Indiana vs Montana Taxes
State income tax: Indiana has a top income tax rate of 2.95%, while Montana has a top income tax rate of 5.65%. Montana's top rate is 2.7 percentage points higher.
Property tax: Indiana: 0.74% effective rate vs Montana: 0.69% of home value per year. Indiana's rate is 0.05 percentage points higher.
Sales tax: Indiana: 7% combined state and average local rate vs Montana: 0%. Indiana's combined rate is 7 percentage points higher.
Official Websites
Indiana official website · Montana official website
More Size Comparisons
All Indiana size comparisons · All Montana 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.