Median rent is 33% lower in St. Peters ($1,291/mo vs $1,924/mo). Buying is cheaper in St. Peters, where the median home runs $252,800 versus $982,600. Households earn more in St. Peters ($89,827 vs $85,364 a year). Taken together, St. Peters is the more affordable choice with a cost index of 99.9 against 99.9 — about 0% lower overall prices. After adjusting income for local prices, a typical paycheck stretches further in St. Peters, MO.
City A
Boulder, CO
City B
St. Peters, MO
How much would you need to earn in St. Peters, MO to maintain your standard of living from Boulder, CO?
Equivalent salary in St. Peters, MO
$74,938
You could earn $62 less (0% lower) and break even.
Based on BEA Regional Price Parity (cost index) for each city's metro area. A rough estimate of overall purchasing power, not tax or take-home pay.
Metric
Boulder
Colorado
St. Peters
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: US Census ACS, BEA RPP, HUD FMR, EPA AirNow, Tax Foundation
Renters will find significantly cheaper housing in St. Peters — median rent of $1,291/mo versus $1,924/mo in Boulder, a 33% difference. Home buyers face a steeper market in Boulder: the median home is $982,600 versus $252,800 in St. Peters — 74% more expensive.
1BR Fair Market Rent
2BR Fair Market Rent
BLS OEWS 2023 — metro-level data
Colorado's top income tax rate is 4.40% versus 4.80% in Missouri, so Boulder is more tax-friendly for high earners. Sales tax is 2.90% in Colorado and 4.22% in Missouri; Boulder has the lower rate (local add-ons may apply in both).
Boulder
Income tax: 4.40%
Sales tax: 2.90%
St. Peters
Income tax: 4.80%
Sales tax: 4.22%
Air quality data is not yet available for these cities.
Pick St. Peters if you prioritize cheaper rent ($1,291/mo median).
Pick Boulder if you prioritize lower state income tax (4.40%).
Is Boulder cheaper than St. Peters?
St. Peters is cheaper overall, with a cost of living index of 99.9 versus 99.9 (US average = 100). That means prices run about 0% lower in St. Peters.
How much is rent in Boulder vs St. Peters?
Median rent is $1,924/mo in Boulder, CO and $1,291/mo in St. Peters, MO. St. Peters, MO has the lower rent by about 33%.
Which has higher salaries — Boulder or St. Peters?
Median household income is $85,364 in Boulder, CO and $89,827 in St. Peters, MO. St. Peters, MO 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?
Air quality data is not yet available for one or both cities.
Which has lower taxes — Boulder or St. Peters?
Colorado's top income tax rate is 4.40% and Missouri's is 4.80%. Boulder, CO has the lower rate.
What salary do I need in St. Peters to match my Boulder income?
To maintain the same purchasing power, a salary of $100,000 in Boulder, CO is equivalent to roughly $99,917 in St. Peters, MO (using the BEA Regional Price Parity ratio). Use the salary calculator above for any income amount.
Data last updated: December 1, 2024 · Sources: US Census ACS, BEA RPP, BLS OEWS, HUD FMR, EPA AirNow, Tax Foundation · Methodology