The map above shows Idaho and Mississippi side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Mississippi Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Mississippi has 46,925 square miles (121,534 km²). Idaho's land area is 1.8 times (76%) larger than Mississippi's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Mississippi: 48,436 square miles (125,448 km²), including inland and coastal water. Idaho's total area is 1.7 times (73%) larger than Mississippi's.
Length: Idaho is 483 miles (778 km) long from north to south; Mississippi is 337 miles (542 km). Idaho's north-south length is 1.4 times (43%) longer than Mississippi's.
Width: Idaho spans 352 miles (566 km) east to west; Mississippi spans 340 miles (547 km). Idaho and Mississippi have about the same east-west width.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Mississippi's is Woodall Mountain at 805 feet (245 m). Borah Peak is 11,826 feet higher than Woodall Mountain.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Mississippi's is Gulf of Mexico at 0 feet. Mississippi's lowest point is 718 feet lower.
Idaho vs Mississippi Population and History
Population: Idaho has a population of 2,001,619 (2024), while Mississippi has 2,943,045 (2024). Mississippi's population is 1.5 times (47%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Mississippi: 62.7. Mississippi's population density is 2.6 times (159%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Mississippi's is Jackson with 141,449. Boise's population is 1.7 times (68%) larger than Jackson's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Mississippi's Memphis, TN-MS-AR metro area (1,339,345). Memphis, TN-MS-AR metro area's population is 1.6 times (58%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Mississippi: Admitted to the Union on December 10, 1817, as the 20th state. In its current form, Mississippi is the older of the two by 73 years.
Idaho vs Mississippi Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Mississippi's $158.2 billion. Mississippi's economic output is 1.2 times (23%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Mississippi: $53,751. Idaho's GDP per capita is 1.2 times (20%) higher than Mississippi's.
Average income: Idaho: $62,323 vs Mississippi: $52,074 average income per person (per capita personal income). Idaho's average income is 1.2 times (20%) higher than Mississippi's.
Idaho vs Mississippi Counties
Number of counties: Idaho has 44 counties, while Mississippi has 82. Mississippi's county count is 1.9 times (86%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Mississippi's is Yazoo County at 922 square miles. Idaho County's land area is 9.2 times (819%) larger than Yazoo County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Mississippi: Alcorn County (400 sq mi). Payette County and Alcorn County have about the same land area.
Most populous county: Idaho: Ada County (535,799 people) vs Mississippi: Harrison County (213,730 people). Ada County's population is 2.5 times (151%) larger than Harrison County's.
Least populous county: Idaho: Clark County (794 people) vs Mississippi: Issaquena County (1,295 people). Issaquena County's population is 1.6 times (63%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Mississippi: Madison County ($90,668). Blaine County's income is 2.2 times (123%) richer than Madison County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Mississippi: Issaquena County ($27,264). Madison County's income is 1.1 times (8%) richer than Issaquena County's.
Idaho vs Mississippi Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Mississippi has a top income tax rate of 4%. Idaho's top rate is 1.3 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Mississippi: 0.65% of home value per year. Mississippi's rate is 0.22 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Mississippi: 7.06%. Mississippi's combined rate is 1.03 percentage points higher.
Official Websites
Idaho official website · Mississippi official website
More Size Comparisons
All Idaho size comparisons · All Mississippi 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.