Cost of Living: St. Louis, MO vs Round Rock, TX (2026)

St. Louis

Missouri
66
VS

Round Rock

Texas
122

St. Louis is 46% cheaper than Round Rock.

$978/mo ↓ 43%
Median Rent
$1,713/mo ↑ 75%
$55,279/yr ↓ 43%
Median Income
$97,187/yr ↑ 76%
$185,100 ↓ 52%
Home Value
$383,700 ↑ 107%
$1,013/mo ↓ 43%
Owner Costs
$1,781/mo ↑ 76%
293,109
Population
124,288

Tax Comparison

4.95%
Income Tax
0%
4.225%
State Sales Tax
6.25%
0.93%
Property Tax
1.6%

Affordability

21.2%
rent-to-income
Affordability
21.2%
rent-to-income

Detailed Comparison

When comparing St. Louis, MO and Round Rock, TX, the overall cost of living indices are 66 and 122 respectively (national median = 100). Rent is $735/month cheaper in St. Louis, saving renters about $8,820/year.

Median household income is $41,908/year higher in Round Rock. Home values also differ significantly — the median in St. Louis is $185,100 compared to $383,700 in Round Rock.

Texas has no state income tax, giving Round Rock residents a significant tax advantage over Missouri's 4.95% rate.

Frequently Asked Questions

St. Louis vs Round Rock — common questions

Is St. Louis or Round Rock cheaper to live in?
Based on our cost index, St. Louis is cheaper to live in with an index of 66 compared to 122 (US average = 100).
What is the rent difference between St. Louis and Round Rock?
Median rent in St. Louis is $978/month and in Round Rock it's $1,713/month — a difference of $735/month.
Which city has higher income, St. Louis or Round Rock?
Median household income is $55,279 in St. Louis and $97,187 in Round Rock. Median household income is $41,908/year higher in Round Rock.
How do taxes compare between Missouri and Texas?
Missouri has 4.95% income tax, 4.225% sales tax, and 0.93% property tax. Texas has 0% income tax, 6.25% sales tax, and 1.6% property tax.
Should I move to St. Louis or Round Rock?
It depends on your priorities. St. Louis has a cost index of 66 with median rent of $978/mo, while Round Rock has a cost index of 122 with rent of $1,713/mo. Consider income potential, tax burden, and lifestyle preferences alongside raw cost data.
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