What St. Louis County property tax looks like
Among the 30 counties covered here, St. Louis County has the 11th highest effective rate and the 23rd highest median bill. Every $100,000 of value carries about $1,225 of tax a year at this rate.
On a $400,000 purchase that comes to roughly $4,900 a year, or $408 a month. Priced at the Missouri average rate instead, the same home would cost $115 a month less in tax.
St. Louis County is separate from the independent City of St. Louis, and Missouri reassesses in odd-numbered years.
Example monthly payment at the median home value
Borrowing $208,560 against a $260,700 St. Louis County home (20% down, 6.5% for 30 years, illustrative rather than quoted) works out as follows.
| Component | Per month |
|---|---|
| Principal and interest | $1,318 |
| Property tax | $266 |
| Homeowners insurance | $150 |
| Mortgage insurance (PMI) | $0 |
| Total | $1,734 |
Property tax is 15.3% of the $1,734 total, so a lender escrowing it would set aside about $266 each month toward the St. Louis County bill.
How reliable this figure is
For St. Louis County the Census Bureau reports a 90% margin of error of ±$39 on the $3,193 median tax and ±$2,616 on the $260,700 median value, so the 1.225% rate is a county-wide average rather than the rate on any one bill.
These medians describe today's owners, not today's buyers. How Missouri values and caps a home, including what resets on sale, is set out on the Missouri page.
Counties with a similar rate
Frequently asked questions
What is the property tax rate in St. Louis County, MO?
The effective rate is 1.225%, which is the median real estate tax paid ($3,193) divided by the median home value ($260,700) in the Census Bureau's 2019-2023 estimates.
How much is property tax on a $400,000 home in St. Louis County?
At this county's effective rate the figure is about $4,900 a year, or $408 a month. That is $115 a month more than the Missouri average rate of 0.88% would give on the same price.
How much of a St. Louis County monthly mortgage payment is property tax?
On a $260,700 home with 20% down at 6.5% over 30 years, property tax is about $266 of a $1,734 total monthly payment, or 15.3%.
Is property tax in St. Louis County high compared with the rest of Missouri?
St. Louis County's 1.225% is 0.35 percentage points above the 0.88% Missouri average, and its $3,193 median bill ranks 23rd of the 30 counties covered here, with the rate ranking 11th.
Source and method
Census American Community Survey, ACS 2019-2023 5-year estimates, released December 2024. For St. Louis County: B25103 median tax $3,193, B25077 median value $260,700, B25003 286,352 owner-occupied homes. Formulas are on the methodology page; every result is an estimate, not a quote or tax advice.