The map above shows Iowa and Oklahoma side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Iowa vs Oklahoma Geography
Land area
- Iowa has a land area of 55,854 square miles (144,660 km²), while Oklahoma has 68,597 square miles (177,665 km²).
- Oklahoma's land area is 1.2 times (23%) larger than Iowa's.
Total area
- Iowa: 56,273 square miles (145,746 km²) vs Oklahoma: 69,899 square miles (181,038 km²), including inland and coastal water.
- Oklahoma's total area is 1.2 times (24%) larger than Iowa's.
Length
- Iowa is 216 miles (347 km) long from north to south; Oklahoma is 533 miles (857 km).
- Oklahoma's north-south length is 2.5 times (147%) longer than Iowa's.
Width
- Iowa spans 335 miles (539 km) east to west; Oklahoma spans 490 miles (789 km).
- Oklahoma's east-west width is 1.5 times (46%) wider than Iowa's.
Highest point
- Iowa's highest point is Hawkeye Point at 1,669 feet (509 m); Oklahoma's is Black Mesa at 4,980 feet (1,518 m).
- Black Mesa is 3,311 feet higher than Hawkeye Point.
Lowest point
- Iowa's lowest point is Mississippi River at 480 feet; Oklahoma's is Little River at 289 feet.
- Oklahoma's lowest point is 191 feet lower.
Iowa vs Oklahoma Population and History
Population
- Iowa has a population of 3,241,488 (2024), while Oklahoma has 4,095,393 (2024).
- Oklahoma's population is 1.3 times (26%) larger than Iowa's.
Population density
- Iowa: 58.0 people per square mile vs Oklahoma: 59.7.
- Iowa and Oklahoma have about the same population density.
Biggest city
- Iowa's biggest city is Des Moines with 213,096 people; Oklahoma's is Oklahoma City with 712,919.
- Oklahoma City's population is 3.3 times (235%) larger than Des Moines'.
Largest metro area
- Iowa's largest metropolitan area is Omaha, NE-IA metro area (1,001,010 people) vs Oklahoma's Oklahoma City, OK metro area (1,497,821).
- Oklahoma City, OK metro area's population is 1.5 times (50%) larger than Omaha, NE-IA metro area's.
History
- Iowa: Admitted to the Union on December 28, 1846, as the 29th state.
- Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state.
- In its current form, Iowa is the older of the two by 61 years.
Iowa vs Oklahoma Economy
GDP
- Iowa's GDP is $265.8 billion (2024) vs Oklahoma's $263.7 billion.
- Iowa and Oklahoma have about the same economic output.
GDP per capita
- Iowa: $81,998 per person vs Oklahoma: $64,388.
- Iowa's GDP per capita is 1.3 times (27%) higher than Oklahoma's.
Average income
- Iowa: $65,225 vs Oklahoma: $63,708 average income per person (per capita personal income).
- Iowa and Oklahoma have about the same average income.
Iowa vs Oklahoma Counties
Number of counties
- Iowa has 99 counties, while Oklahoma has 77.
- Iowa's county count is 1.3 times (29%) higher than Oklahoma's.
Biggest county by area
- Iowa's largest county is Kossuth County at 973 square miles; Oklahoma's is Osage County at 2,247 square miles.
- Osage County's land area is 2.3 times (131%) larger than Kossuth County's.
Smallest county by area
- Iowa: Dickinson County (381 sq mi) vs Oklahoma: Marshall County (372 sq mi).
- Dickinson County and Marshall County have about the same land area.
Most populous county
- Iowa: Polk County (516,185 people) vs Oklahoma: Oklahoma County (816,490 people).
- Oklahoma County's population is 1.6 times (58%) larger than Polk County's.
Least populous county
- Iowa: Adams County (3,606 people) vs Oklahoma: Cimarron County (2,133 people).
- Adams County's population is 1.7 times (69%) larger than Cimarron County's.
Richest county
- Iowa: Mitchell County ($98,211 per capita income) vs Oklahoma: Washington County ($126,749).
- Washington County's income is 1.3 times (29%) richer than Mitchell County's.
Poorest county
- Iowa: Decatur County ($46,134 per capita income) vs Oklahoma: Atoka County ($38,709).
- Decatur County's income is 1.2 times (19%) richer than Atoka County's.
Iowa vs Oklahoma Taxes
State income tax
- Iowa has a top income tax rate of 3.8%, while Oklahoma has a top income tax rate of 4.5%.
- Oklahoma's top rate is 0.7 percentage points higher.
Property tax
- Iowa: 1.29% effective rate vs Oklahoma: 0.75% of home value per year.
- Iowa's rate is 0.54 percentage points higher.
Sales tax
- Iowa: 6.94% combined state and average local rate vs Oklahoma: 9.06%.
- Oklahoma's combined rate is 2.12 percentage points higher.
Official Websites
Iowa official website · Oklahoma official website
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More Size Comparisons
All Iowa 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.