Median rent is 5% lower in Seattle ($2,030/mo vs $2,147/mo). Buying is cheaper in Boston, where the median home runs $731,700 versus $938,600. Households earn more in Seattle ($123,860 vs $97,344 a year). Taken together, Boston is the more affordable choice with a cost index of 110.4 against 112.7 — about 2% lower overall prices. After adjusting income for local prices, a typical paycheck stretches further in Seattle, WA.
Cost of living verdict
Boston is 2% cheaper overall
Cost of Living Index: 110.4 in Boston vs 112.7 in Seattle (US national average = 100)
City A
Boston, MA
City B
Seattle, WA
How much would you need to earn in Seattle, WA to maintain your standard of living from Boston, MA?
Equivalent salary in Seattle, WA
$76,588
You'd need $1,588 more (2% higher).
Based on BEA Regional Price Parity (cost index) for each metro area. This estimates overall purchasing power; it does not account for taxes or take-home pay differences.
Metric
Boston
Massachusetts
Seattle
Washington
Population
Median Household Income
Annual
Median Gross Rent
Per month
Median Home Value
Cost of Living Index
US avg = 100
1BR Fair Market Rent
HUD FMR
2BR Fair Market Rent
HUD FMR
3BR Fair Market Rent
HUD FMR
Air Quality Index
Lower = cleaner
Top State Income Tax
Top marginal rate
State Sales Tax
Statewide base rate
Median Age
Years
✓ = better value · Sources: Census ACS, BEA, HUD Fair Market Rents, EPA AirNow, Tax Foundation
Median rents are similar in both cities: $2,147/mo in Boston and $2,030/mo in Seattle. Home buyers face a steeper market in Seattle: the median home is $938,600 versus $731,700 in Boston — 22% more expensive.
1BR Fair Market Rent
2BR Fair Market Rent
BLS OEWS 2023 — metro-level data
State tax data is not yet available for these cities.
Boston
Income tax: N/A
Sales tax: N/A
Seattle
Income tax: N/A
Sales tax: N/A
Boston has cleaner air on average: 31.0 AQI (Good) compared to 52.0 AQI (Moderate) in the other city. Lower AQI means cleaner, healthier air.
Pick Seattle if you prioritize higher median household income ($123,860/yr).
Pick Boston if you prioritize cleaner air quality (avg AQI 31.0).
Is Boston cheaper than Seattle?
Boston is cheaper overall, with a cost of living index of 110.4 versus 112.7 (US average = 100). That means prices run about 2% lower in Boston.
How much is rent in Boston vs Seattle?
Median rent is $2,147/mo in Boston, MA and $2,030/mo in Seattle, WA. Seattle, WA has the lower rent by about 5%.
Which has higher salaries — Boston or Seattle?
Median household income is $97,344 in Boston, MA and $123,860 in Seattle, WA. Seattle, WA has the higher median income. Note that BLS occupational wages in the table above show wages for specific jobs.
Which city has better air quality?
Boston, MA has better air quality on average: 31.0 AQI versus 52.0 AQI. Both are EPA AirNow annual averages; lower is better.
Which has lower taxes — Boston or Seattle?
State tax data is not yet available for one or both cities.
What salary do I need in Seattle to match my Boston income?
To maintain the same purchasing power, a salary of $100,000 in Boston, MA is equivalent to roughly $102,118 in Seattle, WA (using the BEA Regional Price Parity ratio). Use the salary calculator above for any income amount.
Data last updated: December 1, 2026 · Sources: US Census ACS, BEA RPP, BLS OEWS, HUD FMR, EPA AirNow, Tax Foundation · Methodology
