The map above shows Idaho and Massachusetts side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Massachusetts Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Massachusetts has 7,801 square miles (20,204 km²). Idaho's land area is 10.6 times larger than Massachusetts'.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Massachusetts: 10,554 square miles (27,335 km²), including inland and coastal water. Idaho's total area is 7.9 times (692%) larger than Massachusetts'.
Length: Idaho is 483 miles (778 km) long from north to south; Massachusetts is 123 miles (198 km). Idaho's north-south length is 3.9 times (293%) longer than Massachusetts'.
Width: Idaho spans 352 miles (566 km) east to west; Massachusetts spans 185 miles (297 km). Idaho's east-west width is 1.9 times (90%) wider than Massachusetts'.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Massachusetts's is Mount Greylock at 3,489 feet (1,063 m). Borah Peak is 9,142 feet higher than Mount Greylock.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Massachusetts's is Atlantic Ocean at 0 feet. Massachusetts's lowest point is 718 feet lower.
Idaho vs Massachusetts Population and History
Population: Idaho has a population of 2,001,619 (2024), while Massachusetts has 7,136,171 (2024). Massachusetts' population is 3.6 times (257%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Massachusetts: 914.8. Massachusetts' population density is 37.8 times higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Massachusetts's is Boston with 673,458. Boston's population is 2.8 times (183%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Massachusetts's Boston-Cambridge-Newton, MA-NH metro area (5,025,517). Boston-Cambridge-Newton, MA-NH metro area's population is 5.9 times (494%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Massachusetts: Admitted to the Union on February 6, 1788, as the 6th state. In its current form, Massachusetts is the older of the two by 102 years.
Idaho vs Massachusetts Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Massachusetts's $778.5 billion. Massachusetts' economic output is 6.0 times (503%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Massachusetts: $109,095. Massachusetts' GDP per capita is 1.7 times (69%) higher than Idaho's.
Average income: Idaho: $62,323 vs Massachusetts: $93,607 average income per person (per capita personal income). Massachusetts' average income is 1.5 times (50%) higher than Idaho's.
Idaho vs Massachusetts Counties
Number of counties: Idaho has 44 counties, while Massachusetts has 14. Idaho's county count is 3.1 times (214%) higher than Massachusetts'.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Massachusetts's is Worcester County at 1,511 square miles. Idaho County's land area is 5.6 times (461%) larger than Worcester County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Massachusetts: Nantucket County (46 sq mi). Payette County's land area is 8.8 times (781%) larger than Nantucket County's.
Most populous county: Idaho: Ada County (535,799 people) vs Massachusetts: Middlesex County (1,668,956 people). Middlesex County's population is 3.1 times (211%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Massachusetts: Nantucket County (14,670 people). Nantucket County's population is 18.5 times larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Massachusetts: Nantucket County ($129,250). Blaine County's income is 1.6 times (57%) richer than Nantucket County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Massachusetts: Hampshire County ($65,432). Hampshire County's income is 2.2 times (122%) richer than Madison County's.
Idaho vs Massachusetts Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Massachusetts has a top income tax rate of 9%. Massachusetts's top rate is 3.7 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Massachusetts: 1% of home value per year. Massachusetts's rate is 0.57 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Massachusetts: 6.25%. Massachusetts's combined rate is 0.22 percentage points higher.
Official Websites
Idaho official website · Massachusetts official website
More Size Comparisons
All Idaho size comparisons · All Massachusetts 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.