Median rent is 54% lower in St. Louis ($997/mo vs $2,147/mo). Buying is cheaper in St. Louis, where the median home runs $197,500 versus $731,700. Households earn more in Boston ($97,344 vs $56,160 a year). Taken together, St. Louis is the more affordable choice with a cost index of 95.0 against 110.4 — about 14% lower overall prices. After adjusting income for local prices, a typical paycheck stretches further in Boston, MA.
Cost of living verdict
St. Louis is 14% cheaper overall
Cost of Living Index: 95.0 in St. Louis vs 110.4 in Boston (US national average = 100)
City A
Boston, MA
City B
St. Louis, MO
How much would you need to earn in St. Louis, MO to maintain your standard of living from Boston, MA?
Equivalent salary in St. Louis, MO
$64,524
You could earn $10,476 less (14% lower) and break even.
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
St. Louis
Missouri
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
Renters will find significantly cheaper housing in St. Louis — median rent of $997/mo versus $2,147/mo in Boston, a 54% difference. Home buyers face a steeper market in Boston: the median home is $731,700 versus $197,500 in St. Louis — 73% more expensive.
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
St. Louis
Income tax: N/A
Sales tax: N/A
Boston has cleaner air on average: 31.0 AQI (Good) compared to 33.0 AQI (Good) in the other city. Lower AQI means cleaner, healthier air.
Pick St. Louis if you prioritize lower overall cost of living (index 95.0 vs 110.4).
Pick Boston if you prioritize higher median household income ($97,344/yr).
Pick St. Louis if you prioritize cheaper rent ($997/mo median).
Is Boston cheaper than St. Louis?
St. Louis is cheaper overall, with a cost of living index of 95.0 versus 110.4 (US average = 100). That means prices run about 14% lower in St. Louis.
How much is rent in Boston vs St. Louis?
Median rent is $2,147/mo in Boston, MA and $997/mo in St. Louis, MO. St. Louis, MO has the lower rent by about 54%.
Which has higher salaries — Boston or St. Louis?
Median household income is $97,344 in Boston, MA and $56,160 in St. Louis, MO. Boston, MA 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 33.0 AQI. Both are EPA AirNow annual averages; lower is better.
Which has lower taxes — Boston or St. Louis?
State tax data is not yet available for one or both cities.
What salary do I need in St. Louis to match my Boston income?
To maintain the same purchasing power, a salary of $100,000 in Boston, MA is equivalent to roughly $86,032 in St. Louis, MO (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
