The map above shows Oklahoma and Washington side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Oklahoma vs Washington Geography
Land area: Oklahoma has a land area of 68,597 square miles (177,665 km²), while Washington has 66,455 square miles (172,119 km²). Oklahoma and Washington have about the same land area.
Total area: Oklahoma: 69,899 square miles (181,038 km²) vs Washington: 71,301 square miles (184,668 km²), including inland and coastal water. Oklahoma and Washington have about the same total area.
Length: Oklahoma is 533 miles (857 km) long from north to south; Washington is 238 miles (383 km). Oklahoma's north-south length is 2.2 times (124%) longer than Washington's.
Width: Oklahoma spans 490 miles (789 km) east to west; Washington spans 399 miles (641 km). Oklahoma's east-west width is 1.2 times (23%) wider than Washington's.
Highest point: Oklahoma's highest point is Black Mesa at 4,980 feet (1,518 m); Washington's is Mount Rainier at 14,409 feet (4,392 m). Mount Rainier is 9,429 feet higher than Black Mesa.
Lowest point: Oklahoma's lowest point is Little River at 289 feet; Washington's is Pacific Ocean at 0 feet. Washington's lowest point is 289 feet lower.
Oklahoma vs Washington Population and History
Population: Oklahoma has a population of 4,095,393 (2024), while Washington has 7,958,180 (2024). Washington's population is 1.9 times (94%) larger than Oklahoma's.
Population density: Oklahoma: 59.7 people per square mile vs Washington: 119.8. Washington's population density is 2.0 times (101%) higher than Oklahoma's.
Biggest city: Oklahoma's biggest city is Oklahoma City with 712,919 people; Washington's is Seattle with 780,995. Seattle's population is 1.1 times (10%) larger than Oklahoma City's.
Largest metro area: Oklahoma's largest metropolitan area is Oklahoma City, OK metro area (1,497,821 people) vs Washington's Seattle-Tacoma-Bellevue, WA metro area (4,145,494). Seattle-Tacoma-Bellevue, WA metro area's population is 2.8 times (177%) larger than Oklahoma City, OK metro area's.
History: Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state. Washington: Admitted to the Union on November 11, 1889, as the 42nd state. In its current form, Washington is the older of the two by 18 years.
Oklahoma vs Washington Economy
GDP: Oklahoma's GDP is $263.7 billion (2024) vs Washington's $856.0 billion. Washington's economic output is 3.2 times (225%) larger than Oklahoma's.
GDP per capita: Oklahoma: $64,388 per person vs Washington: $107,564. Washington's GDP per capita is 1.7 times (67%) higher than Oklahoma's.
Average income: Oklahoma: $63,708 vs Washington: $85,187 average income per person (per capita personal income). Washington's average income is 1.3 times (34%) higher than Oklahoma's.
Oklahoma vs Washington Counties
Number of counties: Oklahoma has 77 counties, while Washington has 39. Oklahoma's county count is 2.0 times (97%) higher than Washington's.
Biggest county by area: Oklahoma's largest county is Osage County at 2,247 square miles; Washington's is Okanogan County at 5,266 square miles. Okanogan County's land area is 2.3 times (134%) larger than Osage County's.
Smallest county by area: Oklahoma: Marshall County (372 sq mi) vs Washington: San Juan County (174 sq mi). Marshall County's land area is 2.1 times (114%) larger than San Juan County's.
Most populous county: Oklahoma: Oklahoma County (816,490 people) vs Washington: King County (2,340,211 people). King County's population is 2.9 times (187%) larger than Oklahoma County's.
Least populous county: Oklahoma: Cimarron County (2,133 people) vs Washington: Garfield County (2,404 people). Garfield County's population is 1.1 times (13%) larger than Cimarron County's.
Richest county: Oklahoma: Washington County ($126,749 per capita income) vs Washington: King County ($128,684). Washington County and King County have about the same income.
Poorest county: Oklahoma: Atoka County ($38,709 per capita income) vs Washington: Ferry County ($50,456). Ferry County's income is 1.3 times (30%) richer than Atoka County's.
Oklahoma vs Washington Taxes
State income tax: Oklahoma has a top income tax rate of 4.5%, while Washington has a 9% tax on capital gains only.
Property tax: Oklahoma: 0.75% effective rate vs Washington: 0.79% of home value per year. Washington's rate is 0.04 percentage points higher.
Sales tax: Oklahoma: 9.06% combined state and average local rate vs Washington: 9.57%. Washington's combined rate is 0.51 percentage points higher.
Official Websites
Oklahoma official website · Washington official website
More Size Comparisons
All Oklahoma size comparisons · All Washington 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.