The map above shows Idaho and New Jersey side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs New Jersey Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while New Jersey has 7,355 square miles (19,049 km²). Idaho's land area is 11.2 times larger than New Jersey's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs New Jersey: 8,719 square miles (22,583 km²), including inland and coastal water. Idaho's total area is 9.6 times (858%) larger than New Jersey's.
Length: Idaho is 483 miles (778 km) long from north to south; New Jersey is 169 miles (271 km). Idaho's north-south length is 2.9 times (186%) longer than New Jersey's.
Width: Idaho spans 352 miles (566 km) east to west; New Jersey spans 129 miles (207 km). Idaho's east-west width is 2.7 times (173%) wider than New Jersey's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); New Jersey's is High Point at 1,798 feet (548 m). Borah Peak is 10,833 feet higher than High Point.
Lowest point: Idaho's lowest point is Snake River at 718 feet; New Jersey's is Atlantic Ocean at 0 feet. New Jersey's lowest point is 718 feet lower.
Idaho vs New Jersey Population and History
Population: Idaho has a population of 2,001,619 (2024), while New Jersey has 9,500,851 (2024). New Jersey's population is 4.7 times (375%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs New Jersey: 1,291.8. New Jersey's population density is 53.4 times higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; New Jersey's is Newark with 317,303. Newark's population is 1.3 times (33%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs New Jersey's New York-Newark-Jersey City, NY-NJ metro area (19,940,274). New York-Newark-Jersey City, NY-NJ metro area's population is 23.6 times larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. New Jersey: Admitted to the Union on December 18, 1787, as the 3rd state. In its current form, New Jersey is the older of the two by 103 years.
Idaho vs New Jersey Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs New Jersey's $846.0 billion. New Jersey's economic output is 6.6 times (556%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs New Jersey: $89,045. New Jersey's GDP per capita is 1.4 times (38%) higher than Idaho's.
Average income: Idaho: $62,323 vs New Jersey: $84,893 average income per person (per capita personal income). New Jersey's average income is 1.4 times (36%) higher than Idaho's.
Idaho vs New Jersey Counties
Number of counties: Idaho has 44 counties, while New Jersey has 21. Idaho's county count is 2.1 times (110%) higher than New Jersey's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; New Jersey's is Burlington County at 799 square miles. Idaho County's land area is 10.6 times larger than Burlington County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs New Jersey: Hudson County (46 sq mi). Payette County's land area is 8.8 times (781%) larger than Hudson County's.
Most populous county: Idaho: Ada County (535,799 people) vs New Jersey: Bergen County (978,641 people). Bergen County's population is 1.8 times (83%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs New Jersey: Salem County (65,874 people). Salem County's population is 83.0 times larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs New Jersey: Somerset County ($121,042). Blaine County's income is 1.7 times (67%) richer than Somerset County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs New Jersey: Cumberland County ($50,843). Cumberland County's income is 1.7 times (72%) richer than Madison County's.
Idaho vs New Jersey Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while New Jersey has a top income tax rate of 10.75%. New Jersey's top rate is 5.45 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs New Jersey: 1.89% of home value per year. New Jersey's rate is 1.46 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs New Jersey: 6.6%. New Jersey's combined rate is 0.57 percentage points higher.
Official Websites
Idaho official website · New Jersey official website
More Size Comparisons
All Idaho size comparisons · All New Jersey 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.