The map above shows Idaho and Oklahoma side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Oklahoma Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Oklahoma has 68,597 square miles (177,665 km²). Idaho's land area is 1.2 times (20%) larger than Oklahoma's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Oklahoma: 69,899 square miles (181,038 km²), including inland and coastal water. Idaho's total area is 1.2 times (20%) larger than Oklahoma's.
Length: Idaho is 483 miles (778 km) long from north to south; Oklahoma is 533 miles (857 km). Oklahoma's north-south length is 1.1 times (10%) longer than Idaho's.
Width: Idaho spans 352 miles (566 km) east to west; Oklahoma spans 490 miles (789 km). Oklahoma's east-west width is 1.4 times (39%) wider than Idaho's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Oklahoma's is Black Mesa at 4,980 feet (1,518 m). Borah Peak is 7,651 feet higher than Black Mesa.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Oklahoma's is Little River at 289 feet. Oklahoma's lowest point is 429 feet lower.
Idaho vs Oklahoma Population and History
Population: Idaho has a population of 2,001,619 (2024), while Oklahoma has 4,095,393 (2024). Oklahoma's population is 2.0 times (105%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Oklahoma: 59.7. Oklahoma's population density is 2.5 times (147%) higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Oklahoma's is Oklahoma City with 712,919. Oklahoma City's population is 3.0 times (200%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Oklahoma's Oklahoma City, OK metro area (1,497,821). Oklahoma City, OK metro area's population is 1.8 times (77%) larger than Boise City, ID metro area's.
History: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state. In its current form, Idaho is the older of the two by 17 years.
Idaho vs Oklahoma Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Oklahoma's $263.7 billion. Oklahoma's economic output is 2.0 times (104%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Oklahoma: $64,388. Idaho and Oklahoma have about the same GDP per capita.
Average income: Idaho: $62,323 vs Oklahoma: $63,708 average income per person (per capita personal income). Idaho and Oklahoma have about the same average income.
Idaho vs Oklahoma Counties
Number of counties: Idaho has 44 counties, while Oklahoma has 77. Oklahoma's county count is 1.8 times (75%) higher than Idaho's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Oklahoma's is Osage County at 2,247 square miles. Idaho County's land area is 3.8 times (277%) larger than Osage County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Oklahoma: Marshall County (372 sq mi). Payette County's land area is 1.1 times (10%) larger than Marshall County's.
Most populous county: Idaho: Ada County (535,799 people) vs Oklahoma: Oklahoma County (816,490 people). Oklahoma County's population is 1.5 times (52%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Oklahoma: Cimarron County (2,133 people). Cimarron County's population is 2.7 times (169%) larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Oklahoma: Washington County ($126,749). Blaine County's income is 1.6 times (60%) richer than Washington County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Oklahoma: Atoka County ($38,709). Atoka County's income is 1.3 times (31%) richer than Madison County's.
Idaho vs Oklahoma Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Oklahoma has a top income tax rate of 4.5%. Idaho's top rate is 0.8 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Oklahoma: 0.75% of home value per year. Oklahoma's rate is 0.32 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Oklahoma: 9.06%. Oklahoma's combined rate is 3.03 percentage points higher.
Official Websites
Idaho official website · Oklahoma official website
More Size Comparisons
All Idaho size comparisons · All Oklahoma 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.