The map above shows Idaho and Louisiana side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Louisiana Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Louisiana has 43,213 square miles (111,921 km²). Idaho's land area is 1.9 times (91%) larger than Louisiana's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Louisiana: 52,375 square miles (135,652 km²), including inland and coastal water. Idaho's total area is 1.6 times (60%) larger than Louisiana's.
Length: Idaho is 483 miles (778 km) long from north to south; Louisiana is 301 miles (484 km). Idaho's north-south length is 1.6 times (60%) longer than Louisiana's.
Width: Idaho spans 352 miles (566 km) east to west; Louisiana spans 356 miles (574 km). Idaho and Louisiana have about the same east-west width.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Louisiana's is Driskill Mountain at 533 feet (162 m). Borah Peak is 12,098 feet higher than Driskill Mountain.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Louisiana's is New Orleans at -8 feet. Louisiana's lowest point is 726 feet lower.
Idaho vs Louisiana Population and History
Population: Idaho has a population of 2,001,619 (2024), while Louisiana has 4,597,740 (2024). Louisiana's population is 2.3 times (130%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Louisiana: 106.4. Louisiana's population density is 4.4 times (340%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Louisiana's is New Orleans with 362,701. New Orleans' population is 1.5 times (52%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Louisiana's New Orleans-Metairie, LA metro area (966,230). New Orleans-Metairie, LA metro area's population is 1.1 times (14%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Louisiana: Admitted to the Union on April 30, 1812, as the 18th state. In its current form, Louisiana is the older of the two by 78 years.
Idaho vs Louisiana Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Louisiana's $329.2 billion. Louisiana's economic output is 2.6 times (155%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Louisiana: $71,594. Louisiana's GDP per capita is 1.1 times (11%) higher than Idaho's.
Average income: Idaho: $62,323 vs Louisiana: $61,897 average income per person (per capita personal income). Idaho and Louisiana have about the same average income.
Idaho vs Louisiana Counties
Number of counties: Idaho has 44 counties, while Louisiana has 64. Louisiana's county count is 1.5 times (45%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Louisiana's is Vernon Parish at 1,327 square miles. Idaho County's land area is 6.4 times (539%) larger than Vernon Parish's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Louisiana: Orleans Parish (170 sq mi). Payette County's land area is 2.4 times (140%) larger than Orleans Parish's.
Most populous county: Idaho: Ada County (535,799 people) vs Louisiana: East Baton Rouge Parish (453,022 people). Ada County's population is 1.2 times (18%) larger than East Baton Rouge Parish's.
Least populous county: Idaho: Clark County (794 people) vs Louisiana: Tensas Parish (3,844 people). Tensas Parish's population is 4.8 times (384%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Louisiana: St. Tammany Parish ($82,398). Blaine County's income is 2.5 times (146%) richer than St. Tammany Parish's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Louisiana: East Carroll Parish ($36,751). East Carroll Parish's income is 1.2 times (25%) richer than Madison County's.
Idaho vs Louisiana Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Louisiana has a top income tax rate of 3%. Idaho's top rate is 2.3 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Louisiana: 0.53% of home value per year. Louisiana's rate is 0.1 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Louisiana: 10.13%. Louisiana's combined rate is 4.1 percentage points higher.
Official Websites
Idaho official website · Louisiana official website
More Size Comparisons
All Idaho size comparisons · All Louisiana 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.