The map above shows Arizona and Washington side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Washington Geography
Land area: Arizona has a land area of 113,655 square miles (294,366 km²), while Washington has 66,455 square miles (172,119 km²). Arizona's land area is 1.7 times (71%) larger than Washington's.
Total area: Arizona: 113,985 square miles (295,220 km²) vs Washington: 71,301 square miles (184,668 km²), including inland and coastal water. Arizona's total area is 1.6 times (60%) larger than Washington's.
Length: Arizona is 429 miles (690 km) long from north to south; Washington is 238 miles (383 km). Arizona's north-south length is 1.8 times (80%) longer than Washington's.
Width: Arizona spans 452 miles (727 km) east to west; Washington spans 399 miles (641 km). Arizona's east-west width is 1.1 times (13%) wider than Washington's.
Highest point: Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Washington's is Mount Rainier at 14,409 feet (4,392 m). Mount Rainier is 1,789 feet higher than Humphreys Peak.
Lowest point: Arizona's lowest point is Colorado River at 71 feet; Washington's is Pacific Ocean at 0 feet. Washington's lowest point is 71 feet lower.
Arizona vs Washington Population and History
Population: Arizona has a population of 7,582,384 (2024), while Washington has 7,958,180 (2024). Washington's population is 1.0 times (5%) larger than Arizona's.
Population density: Arizona: 66.7 people per square mile vs Washington: 119.8. Washington's population density is 1.8 times (80%) higher than Arizona's.
Biggest city: Arizona's biggest city is Phoenix with 1,673,164 people; Washington's is Seattle with 780,995. Phoenix's population is 2.1 times (114%) larger than Seattle's.
Largest metro area: Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Washington's Seattle-Tacoma-Bellevue, WA metro area (4,145,494). Phoenix-Mesa-Chandler, AZ metro area's population is 1.3 times (25%) larger than Seattle-Tacoma-Bellevue, WA metro area's.
History: Arizona: Admitted to the Union on February 14, 1912, as the 48th 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 23 years.
Arizona vs Washington Economy
GDP: Arizona's GDP is $570.1 billion (2024) vs Washington's $856.0 billion. Washington's economic output is 1.5 times (50%) larger than Arizona's.
GDP per capita: Arizona: $75,186 per person vs Washington: $107,564. Washington's GDP per capita is 1.4 times (43%) higher than Arizona's.
Average income: Arizona: $65,798 vs Washington: $85,187 average income per person (per capita personal income). Washington's average income is 1.3 times (29%) higher than Arizona's.
Arizona vs Washington Counties
Number of counties: Arizona has 15 counties, while Washington has 39. Washington's county count is 2.6 times (160%) higher than Arizona's.
Biggest county by area: Arizona's largest county is Coconino County at 18,616 square miles; Washington's is Okanogan County at 5,266 square miles. Coconino County's land area is 3.5 times (254%) larger than Okanogan County's.
Smallest county by area: Arizona: Santa Cruz County (1,236 sq mi) vs Washington: San Juan County (174 sq mi). Santa Cruz County's land area is 7.1 times (611%) larger than San Juan County's.
Most populous county: Arizona: Maricopa County (4,673,096 people) vs Washington: King County (2,340,211 people). Maricopa County's population is 2.0 times (100%) larger than King County's.
Least populous county: Arizona: Greenlee County (9,410 people) vs Washington: Garfield County (2,404 people). Greenlee County's population is 3.9 times (291%) larger than Garfield County's.
Richest county: Arizona: Maricopa County ($72,176 per capita income) vs Washington: King County ($128,684). King County's income is 1.8 times (78%) richer than Maricopa County's.
Poorest county: Arizona: Graham County ($44,164 per capita income) vs Washington: Ferry County ($50,456). Ferry County's income is 1.1 times (14%) richer than Graham County's.
Arizona vs Washington Taxes
State income tax: Arizona has a top income tax rate of 2.5%, while Washington has a 9% tax on capital gains only.
Property tax: Arizona: 0.43% effective rate vs Washington: 0.79% of home value per year. Washington's rate is 0.36 percentage points higher.
Sales tax: Arizona: 8.54% combined state and average local rate vs Washington: 9.57%. Washington's combined rate is 1.03 percentage points higher.
Official Websites
Arizona official website · Washington official website
More Size Comparisons
All Arizona 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.