The map above shows Arkansas and Idaho side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arkansas vs Idaho Geography
Land area: Arkansas has a land area of 51,992 square miles (134,658 km²), while Idaho has 82,645 square miles (214,051 km²). Idaho's land area is 1.6 times (59%) larger than Arkansas'.
Total area: Arkansas: 53,198 square miles (137,781 km²) vs Idaho: 83,569 square miles (216,441 km²), including inland and coastal water. Idaho's total area is 1.6 times (57%) larger than Arkansas'.
Length: Arkansas is 243 miles (392 km) long from north to south; Idaho is 483 miles (778 km). Idaho's north-south length is 2.0 times (99%) longer than Arkansas'.
Width: Arkansas spans 279 miles (449 km) east to west; Idaho spans 352 miles (566 km). Idaho's east-west width is 1.3 times (26%) wider than Arkansas'.
Highest point: Arkansas's highest point is Mount Magazine at 2,752 feet (839 m); Idaho's is Borah Peak at 12,631 feet (3,850 m). Borah Peak is 9,879 feet higher than Mount Magazine.
Lowest point: Arkansas's lowest point is Ouachita River at 55 feet; Idaho's is Snake River at 718 feet. Arkansas's lowest point is 663 feet lower.
Arkansas vs Idaho Population and History
Population: Arkansas has a population of 3,088,354 (2024), while Idaho has 2,001,619 (2024). Arkansas' population is 1.5 times (54%) larger than Idaho's.
Population density: Arkansas: 59.4 people per square mile vs Idaho: 24.2. Arkansas' population density is 2.5 times (145%) higher than Idaho's.
Biggest city: Arkansas's biggest city is Little Rock with 204,774 people; Idaho's is Boise with 237,963. Boise's population is 1.2 times (16%) larger than Little Rock's.
Largest metro area: Arkansas's largest metropolitan area is Memphis, TN-MS-AR metro area (1,339,345 people) vs Idaho's Boise City, ID metro area (845,877). Memphis, TN-MS-AR metro area's population is 1.6 times (58%) larger than Boise City, ID metro area's.
History: Arkansas: Admitted to the Union on June 15, 1836, as the 25th state. Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. In its current form, Arkansas is the older of the two by 54 years.
Arkansas vs Idaho Economy
GDP: Arkansas's GDP is $188.3 billion (2024) vs Idaho's $129.0 billion. Arkansas' economic output is 1.5 times (46%) larger than Idaho's.
GDP per capita: Arkansas: $60,984 per person vs Idaho: $64,457. Idaho's GDP per capita is 1.1 times (6%) higher than Arkansas'.
Average income: Arkansas: $59,320 vs Idaho: $62,323 average income per person (per capita personal income). Idaho's average income is 1.1 times (5%) higher than Arkansas'.
Arkansas vs Idaho Counties
Number of counties: Arkansas has 75 counties, while Idaho has 44. Arkansas' county count is 1.7 times (70%) higher than Idaho's.
Biggest county by area: Arkansas's largest county is Union County at 1,039 square miles; Idaho's is Idaho County at 8,478 square miles. Idaho County's land area is 8.2 times (716%) larger than Union County's.
Smallest county by area: Arkansas: Lafayette County (530 sq mi) vs Idaho: Payette County (407 sq mi). Lafayette County's land area is 1.3 times (30%) larger than Payette County's.
Most populous county: Arkansas: Pulaski County (401,209 people) vs Idaho: Ada County (535,799 people). Ada County's population is 1.3 times (34%) larger than Pulaski County's.
Least populous county: Arkansas: Calhoun County (4,690 people) vs Idaho: Clark County (794 people). Calhoun County's population is 5.9 times (491%) larger than Clark County's.
Richest county: Arkansas: Benton County ($120,594 per capita income) vs Idaho: Blaine County ($202,612). Blaine County's income is 1.7 times (68%) richer than Benton County's.
Poorest county: Arkansas: Lincoln County ($36,032 per capita income) vs Idaho: Madison County ($29,485). Lincoln County's income is 1.2 times (22%) richer than Madison County's.
Arkansas vs Idaho Taxes
State income tax: Arkansas has a top income tax rate of 3.9%, while Idaho has a top income tax rate of 5.3%. Idaho's top rate is 1.4 percentage points higher.
Property tax: Arkansas: 0.52% effective rate vs Idaho: 0.43% of home value per year. Arkansas's rate is 0.09 percentage points higher.
Sales tax: Arkansas: 9.48% combined state and average local rate vs Idaho: 6.03%. Arkansas's combined rate is 3.45 percentage points higher.
Official Websites
Arkansas official website · Idaho official website
More Size Comparisons
All Arkansas size comparisons · All Idaho 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.