The map above shows Idaho and Missouri side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Missouri Geography
Land area
- Idaho has a land area of 82,645 square miles (214,051 km²), while Missouri has 68,746 square miles (178,052 km²).
- Idaho's land area is 1.2 times (20%) larger than Missouri's.
Total area
- Idaho: 83,569 square miles (216,441 km²) vs Missouri: 69,707 square miles (180,540 km²), including inland and coastal water.
- Idaho's total area is 1.2 times (20%) larger than Missouri's.
Length
- Idaho is 483 miles (778 km) long from north to south; Missouri is 328 miles (529 km).
- Idaho's north-south length is 1.5 times (47%) longer than Missouri's.
Width
- Idaho spans 352 miles (566 km) east to west; Missouri spans 437 miles (703 km).
- Missouri's east-west width is 1.2 times (24%) wider than Idaho's.
Highest point
- Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Missouri's is Taum Sauk Mountain at 1,771 feet (540 m).
- Borah Peak is 10,860 feet higher than Taum Sauk Mountain.
Lowest point
- Idaho's lowest point is Snake River at 718 feet; Missouri's is St. Francis River at 230 feet.
- Missouri's lowest point is 488 feet lower.
Idaho vs Missouri Population and History
Population
- Idaho has a population of 2,001,619 (2024), while Missouri has 6,245,466 (2024).
- Missouri's population is 3.1 times (212%) larger than Idaho's.
Population density
- Idaho: 24.2 people per square mile vs Missouri: 90.8.
- Missouri's population density is 3.8 times (275%) higher than Idaho's.
Biggest city
- Idaho's biggest city is Boise with 237,963 people; Missouri's is Kansas City with 516,032.
- Kansas City's population is 2.2 times (117%) larger than Boise's.
Largest metro area
- Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Missouri's St. Louis, MO-IL metro area (2,811,927).
- St. Louis, MO-IL metro area's population is 3.3 times (232%) larger than Boise City, ID metro area's.
History
- Idaho: Admitted to the Union on July 3, 1890, as the 43rd state.
- Missouri: Admitted to the Union on August 10, 1821, as the 24th state.
- In its current form, Missouri is the older of the two by 69 years.
Idaho vs Missouri Economy
GDP
- Idaho's GDP is $129.0 billion (2024) vs Missouri's $448.7 billion.
- Missouri's economic output is 3.5 times (248%) larger than Idaho's.
GDP per capita
- Idaho: $64,457 per person vs Missouri: $71,846.
- Missouri's GDP per capita is 1.1 times (11%) higher than Idaho's.
Average income
- Idaho: $62,323 vs Missouri: $64,920 average income per person (per capita personal income).
- Idaho and Missouri have about the same average income.
Idaho vs Missouri Counties
Number of counties
- Idaho has 44 counties, while Missouri has 115.
- Missouri's county count is 2.6 times (161%) higher than Idaho's.
Biggest county by area
- Idaho's largest county is Idaho County at 8,478 square miles; Missouri's is Texas County at 1,177 square miles.
- Idaho County's land area is 7.2 times (620%) larger than Texas County's.
Smallest county by area
- Idaho: Payette County (407 sq mi) vs Missouri: St. Louis city (62 sq mi).
- Payette County's land area is 6.6 times (559%) larger than St. Louis city's.
Most populous county
- Idaho: Ada County (535,799 people) vs Missouri: St. Louis County (992,929 people).
- St. Louis County's population is 1.9 times (85%) larger than Ada County's.
Least populous county
- Idaho: Clark County (794 people) vs Missouri: Worth County (1,872 people).
- Worth County's population is 2.4 times (136%) larger than Clark County's.
Richest county
- Idaho: Blaine County ($202,612 per capita income) vs Missouri: St. Louis County ($104,775).
- Blaine County's income is 1.9 times (93%) richer than St. Louis County's.
Poorest county
- Idaho: Madison County ($29,485 per capita income) vs Missouri: Douglas County ($40,515).
- Douglas County's income is 1.4 times (37%) richer than Madison County's.
Idaho vs Missouri Taxes
State income tax
- Idaho has a top income tax rate of 5.3%, while Missouri has a top income tax rate of 4.7%.
- Idaho's top rate is 0.6 percentage points higher.
Property tax
- Idaho: 0.43% effective rate vs Missouri: 0.79% of home value per year.
- Missouri's rate is 0.36 percentage points higher.
Sales tax
- Idaho: 6.03% combined state and average local rate vs Missouri: 8.44%.
- Missouri's combined rate is 2.41 percentage points higher.
Official Websites
Idaho official website · Missouri official website
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More Size Comparisons
All Idaho size comparisons · All Missouri 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.