The map above shows Idaho and Tennessee side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Tennessee Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Tennessee has 41,224 square miles (106,770 km²). Idaho's land area is 2.0 times (100%) larger than Tennessee's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Tennessee: 42,130 square miles (109,116 km²), including inland and coastal water. Idaho's total area is 2.0 times (98%) larger than Tennessee's.
Length: Idaho is 483 miles (778 km) long from north to south; Tennessee is 191 miles (308 km). Idaho's north-south length is 2.5 times (153%) longer than Tennessee's.
Width: Idaho spans 352 miles (566 km) east to west; Tennessee spans 497 miles (800 km). Tennessee's east-west width is 1.4 times (41%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Tennessee's is Clingmans Dome at 6,624 feet (2,019 m). Borah Peak is 6,007 feet higher than Clingmans Dome.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Tennessee's is Mississippi River at 178 feet. Tennessee's lowest point is 540 feet lower.
Idaho vs Tennessee Population and History
Population: Idaho has a population of 2,001,619 (2024), while Tennessee has 7,227,750 (2024). Tennessee's population is 3.6 times (261%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Tennessee: 175.3. Tennessee's population density is 7.2 times (624%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Tennessee's is Nashville with 704,963. Nashville's population is 3.0 times (196%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Tennessee's Nashville-Davidson--Murfreesboro--Franklin, TN metro area (2,150,553). Nashville-Davidson--Murfreesboro--Franklin, TN metro area's population is 2.5 times (154%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Tennessee: Admitted to the Union on June 1, 1796, as the 16th state. In its current form, Tennessee is the older of the two by 94 years.
Idaho vs Tennessee Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Tennessee's $561.2 billion. Tennessee's economic output is 4.4 times (335%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Tennessee: $77,645. Tennessee's GDP per capita is 1.2 times (20%) higher than Idaho's.
Average income: Idaho: $62,323 vs Tennessee: $66,504 average income per person (per capita personal income). Tennessee's average income is 1.1 times (7%) higher than Idaho's.
Idaho vs Tennessee Counties
Number of counties: Idaho has 44 counties, while Tennessee has 95. Tennessee's county count is 2.2 times (116%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Tennessee's is Shelby County at 753 square miles. Idaho County's land area is 11.3 times larger than Shelby County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Tennessee: Trousdale County (114 sq mi). Payette County's land area is 3.6 times (256%) larger than Trousdale County's.
Most populous county: Idaho: Ada County (535,799 people) vs Tennessee: Shelby County (910,530 people). Shelby County's population is 1.7 times (70%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Tennessee: Pickett County (5,108 people). Pickett County's population is 6.4 times (543%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Tennessee: Williamson County ($139,704). Blaine County's income is 1.5 times (45%) richer than Williamson County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Tennessee: Lake County ($31,572). Lake County's income is 1.1 times (7%) richer than Madison County's.
Idaho vs Tennessee Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Tennessee has no state income tax. Idaho's top rate is 5.3 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Tennessee: 0.45% of home value per year. Tennessee's rate is 0.02 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Tennessee: 9.61%. Tennessee's combined rate is 3.58 percentage points higher.
Official Websites
Idaho official website · Tennessee official website
More Size Comparisons
All Idaho size comparisons · All Tennessee 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.