The map above shows Massachusetts and Washington side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Massachusetts vs Washington Geography
Land area: Massachusetts has a land area of 7,801 square miles (20,204 km²), while Washington has 66,455 square miles (172,119 km²). Washington's land area is 8.5 times (752%) larger than Massachusetts'.
Total area: Massachusetts: 10,554 square miles (27,335 km²) vs Washington: 71,301 square miles (184,668 km²), including inland and coastal water. Washington's total area is 6.8 times (576%) larger than Massachusetts'.
Length: Massachusetts is 123 miles (198 km) long from north to south; Washington is 238 miles (383 km). Washington's north-south length is 1.9 times (93%) longer than Massachusetts'.
Width: Massachusetts spans 185 miles (297 km) east to west; Washington spans 399 miles (641 km). Washington's east-west width is 2.2 times (116%) wider than Massachusetts'.
Highest point: Massachusetts's highest point is Mount Greylock at 3,489 feet (1,063 m); Washington's is Mount Rainier at 14,409 feet (4,392 m). Mount Rainier is 10,920 feet higher than Mount Greylock.
Lowest point: Massachusetts's lowest point is Atlantic Ocean at 0 feet; Washington's is Pacific Ocean at 0 feet. Both lowest points are at or near sea level.
Massachusetts vs Washington Population and History
Population: Massachusetts has a population of 7,136,171 (2024), while Washington has 7,958,180 (2024). Washington's population is 1.1 times (12%) larger than Massachusetts'.
Population density: Massachusetts: 914.8 people per square mile vs Washington: 119.8. Massachusetts' population density is 7.6 times (664%) higher than Washington's.
Biggest city: Massachusetts's biggest city is Boston with 673,458 people; Washington's is Seattle with 780,995. Seattle's population is 1.2 times (16%) larger than Boston's.
Largest metro area: Massachusetts's largest metropolitan area is Boston-Cambridge-Newton, MA-NH metro area (5,025,517 people) vs Washington's Seattle-Tacoma-Bellevue, WA metro area (4,145,494). Boston-Cambridge-Newton, MA-NH metro area's population is 1.2 times (21%) larger than Seattle-Tacoma-Bellevue, WA metro area's.
History: Massachusetts: Admitted to the Union on February 6, 1788, as the 6th state. Washington: Admitted to the Union on November 11, 1889, as the 42nd state. In its current form, Massachusetts is the older of the two by 101 years.
Massachusetts vs Washington Economy
GDP: Massachusetts's GDP is $778.5 billion (2024) vs Washington's $856.0 billion. Washington's economic output is 1.1 times (10%) larger than Massachusetts'.
GDP per capita: Massachusetts: $109,095 per person vs Washington: $107,564. Massachusetts and Washington have about the same GDP per capita.
Average income: Massachusetts: $93,607 vs Washington: $85,187 average income per person (per capita personal income). Massachusetts' average income is 1.1 times (10%) higher than Washington's.
Massachusetts vs Washington Counties
Number of counties: Massachusetts has 14 counties, while Washington has 39. Washington's county count is 2.8 times (179%) higher than Massachusetts'.
Biggest county by area: Massachusetts's largest county is Worcester County at 1,511 square miles; Washington's is Okanogan County at 5,266 square miles. Okanogan County's land area is 3.5 times (249%) larger than Worcester County's.
Smallest county by area: Massachusetts: Nantucket County (46 sq mi) vs Washington: San Juan County (174 sq mi). San Juan County's land area is 3.8 times (276%) larger than Nantucket County's.
Most populous county: Massachusetts: Middlesex County (1,668,956 people) vs Washington: King County (2,340,211 people). King County's population is 1.4 times (40%) larger than Middlesex County's.
Least populous county: Massachusetts: Nantucket County (14,670 people) vs Washington: Garfield County (2,404 people). Nantucket County's population is 6.1 times (510%) larger than Garfield County's.
Richest county: Massachusetts: Nantucket County ($129,250 per capita income) vs Washington: King County ($128,684). Nantucket County and King County have about the same income.
Poorest county: Massachusetts: Hampshire County ($65,432 per capita income) vs Washington: Ferry County ($50,456). Hampshire County's income is 1.3 times (30%) richer than Ferry County's.
Massachusetts vs Washington Taxes
State income tax: Massachusetts has a top income tax rate of 9%, while Washington has a 9% tax on capital gains only.
Property tax: Massachusetts: 1% effective rate vs Washington: 0.79% of home value per year. Massachusetts's rate is 0.21 percentage points higher.
Sales tax: Massachusetts: 6.25% combined state and average local rate vs Washington: 9.57%. Washington's combined rate is 3.32 percentage points higher.
Official Websites
Massachusetts official website · Washington official website
More Size Comparisons
All Massachusetts 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.