The map above shows Ohio and Washington side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs Washington Geography
Land area: Ohio has a land area of 40,859 square miles (105,824 km²), while Washington has 66,455 square miles (172,119 km²). Washington's land area is 1.6 times (63%) larger than Ohio's.
Total area: Ohio: 44,826 square miles (116,098 km²) vs Washington: 71,301 square miles (184,668 km²), including inland and coastal water. Washington's total area is 1.6 times (59%) larger than Ohio's.
Length: Ohio is 291 miles (468 km) long from north to south; Washington is 238 miles (383 km). Ohio's north-south length is 1.2 times (22%) longer than Washington's.
Width: Ohio spans 317 miles (510 km) east to west; Washington spans 399 miles (641 km). Washington's east-west width is 1.3 times (26%) wider than Ohio's.
Highest point: Ohio's highest point is Campbell Hill at 1,547 feet (472 m); Washington's is Mount Rainier at 14,409 feet (4,392 m). Mount Rainier is 12,862 feet higher than Campbell Hill.
Lowest point: Ohio's lowest point is Ohio River at 455 feet; Washington's is Pacific Ocean at 0 feet. Washington's lowest point is 455 feet lower.
Ohio vs Washington Population and History
Population: Ohio has a population of 11,883,304 (2024), while Washington has 7,958,180 (2024). Ohio's population is 1.5 times (49%) larger than Washington's.
Population density: Ohio: 290.8 people per square mile vs Washington: 119.8. Ohio's population density is 2.4 times (143%) higher than Washington's.
Biggest city: Ohio's biggest city is Columbus with 933,263 people; Washington's is Seattle with 780,995. Columbus' population is 1.2 times (19%) larger than Seattle's.
Largest metro area: Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs Washington's Seattle-Tacoma-Bellevue, WA metro area (4,145,494). Seattle-Tacoma-Bellevue, WA metro area's population is 1.8 times (80%) larger than Cincinnati, OH-KY-IN metro area's.
History: Ohio: Admitted to the Union on March 1, 1803, as the 17th state. Washington: Admitted to the Union on November 11, 1889, as the 42nd state. In its current form, Ohio is the older of the two by 86 years.
Ohio vs Washington Economy
GDP: Ohio's GDP is $923.1 billion (2024) vs Washington's $856.0 billion. Ohio's economic output is 1.1 times (8%) larger than Washington's.
GDP per capita: Ohio: $77,684 per person vs Washington: $107,564. Washington's GDP per capita is 1.4 times (38%) higher than Ohio's.
Average income: Ohio: $64,464 vs Washington: $85,187 average income per person (per capita personal income). Washington's average income is 1.3 times (32%) higher than Ohio's.
Ohio vs Washington Counties
Number of counties: Ohio has 88 counties, while Washington has 39. Ohio's county count is 2.3 times (126%) higher than Washington's.
Biggest county by area: Ohio's largest county is Ashtabula County at 702 square miles; Washington's is Okanogan County at 5,266 square miles. Okanogan County's land area is 7.5 times (650%) larger than Ashtabula County's.
Smallest county by area: Ohio: Lake County (229 sq mi) vs Washington: San Juan County (174 sq mi). Lake County's land area is 1.3 times (32%) larger than San Juan County's.
Most populous county: Ohio: Franklin County (1,356,303 people) vs Washington: King County (2,340,211 people). King County's population is 1.7 times (73%) larger than Franklin County's.
Least populous county: Ohio: Vinton County (12,545 people) vs Washington: Garfield County (2,404 people). Vinton County's population is 5.2 times (422%) larger than Garfield County's.
Richest county: Ohio: Delaware County ($96,573 per capita income) vs Washington: King County ($128,684). King County's income is 1.3 times (33%) richer than Delaware County's.
Poorest county: Ohio: Noble County ($34,940 per capita income) vs Washington: Ferry County ($50,456). Ferry County's income is 1.4 times (44%) richer than Noble County's.
Ohio vs Washington Taxes
State income tax: Ohio has a top income tax rate of 2.75%, while Washington has a 9% tax on capital gains only.
Property tax: Ohio: 1.22% effective rate vs Washington: 0.79% of home value per year. Ohio's rate is 0.43 percentage points higher.
Sales tax: Ohio: 7.29% combined state and average local rate vs Washington: 9.57%. Washington's combined rate is 2.28 percentage points higher.
Official Websites
Ohio official website · Washington official website
More Size Comparisons
All Ohio 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.