The map above shows Idaho and New Hampshire side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs New Hampshire Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while New Hampshire has 8,954 square miles (23,190 km²). Idaho's land area is 9.2 times (823%) larger than New Hampshire's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs New Hampshire: 9,350 square miles (24,216 km²), including inland and coastal water. Idaho's total area is 8.9 times (794%) larger than New Hampshire's.
Length: Idaho is 483 miles (778 km) long from north to south; New Hampshire is 180 miles (290 km). Idaho's north-south length is 2.7 times (168%) longer than New Hampshire's.
Width: Idaho spans 352 miles (566 km) east to west; New Hampshire spans 95 miles (152 km). Idaho's east-west width is 3.7 times (271%) wider than New Hampshire's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); New Hampshire's is Mount Washington at 6,277 feet (1,913 m). Borah Peak is 6,354 feet higher than Mount Washington.
Lowest point: Idaho's lowest point is Snake River at 718 feet; New Hampshire's is Atlantic Ocean at 0 feet. New Hampshire's lowest point is 718 feet lower.
Idaho vs New Hampshire Population and History
Population: Idaho has a population of 2,001,619 (2024), while New Hampshire has 1,409,032 (2024). Idaho's population is 1.4 times (42%) larger than New Hampshire's.
Population density: Idaho: 24.2 people per square mile vs New Hampshire: 157.4. New Hampshire's population density is 6.5 times (550%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; New Hampshire's is Manchester with 116,386. Boise's population is 2.0 times (104%) larger than Manchester's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs New Hampshire'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. New Hampshire: Admitted to the Union on June 21, 1788, as the 9th state. In its current form, New Hampshire is the older of the two by 102 years.
Idaho vs New Hampshire Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs New Hampshire's $119.3 billion. Idaho's economic output is 1.1 times (8%) larger than New Hampshire's.
GDP per capita: Idaho: $64,457 per person vs New Hampshire: $84,694. New Hampshire's GDP per capita is 1.3 times (31%) higher than Idaho's.
Average income: Idaho: $62,323 vs New Hampshire: $83,192 average income per person (per capita personal income). New Hampshire's average income is 1.3 times (33%) higher than Idaho's.
Idaho vs New Hampshire Counties
Number of counties: Idaho has 44 counties, while New Hampshire has 10. Idaho's county count is 4.4 times (340%) higher than New Hampshire's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; New Hampshire's is Coos County at 1,795 square miles. Idaho County's land area is 4.7 times (372%) larger than Coos County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs New Hampshire: Strafford County (368 sq mi). Payette County's land area is 1.1 times (11%) larger than Strafford County's.
Most populous county: Idaho: Ada County (535,799 people) vs New Hampshire: Hillsborough County (430,462 people). Ada County's population is 1.2 times (24%) larger than Hillsborough County's.
Least populous county: Idaho: Clark County (794 people) vs New Hampshire: Coos County (31,094 people). Coos County's population is 39.2 times larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs New Hampshire: Rockingham County ($100,216). Blaine County's income is 2.0 times (102%) richer than Rockingham County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs New Hampshire: Coos County ($60,657). Coos County's income is 2.1 times (106%) richer than Madison County's.
Idaho vs New Hampshire Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while New Hampshire has no state income tax. Idaho's top rate is 5.3 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs New Hampshire: 1.46% of home value per year. New Hampshire's rate is 1.03 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs New Hampshire: 0%. Idaho's combined rate is 6.03 percentage points higher.
Official Websites
Idaho official website · New Hampshire official website
More Size Comparisons
All Idaho size comparisons · All New Hampshire 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.