Sales tax in St. Louis County, Missouri
There is no single sales tax rate in St. Louis County. It runs from 7.738% to 12.238% depending on the exact address, because cities and special districts inside the county levy their own on top of the 4.225% state rate. The 4.225% state rate applies everywhere in the county; everything above that depends on where you are standing.
What is the sales tax rate in St. Louis County?
| Missouri state rate | 4.225% |
|---|---|
| St. Louis County rate | 3.513% |
| Lowest combined rate in the county | 7.738% |
| Highest combined rate in the county | 12.238% |
The two combined figures are the lowest and highest totals found anywhere inside the county. They are not a state rate plus a county rate added together, and adding the rows above will not reproduce them, because cities and special districts levy in between.
Why the rate here is not the whole story
Missouri charges 4.225 percent statewide and then stacks a county rate, city rates and special district rates whose boundaries do not follow county lines, so a single rate for the whole county does not exist. The county itself levies 3.513 percent countywide. The floor of 7.738 percent is state plus county in unincorporated areas with no city and no district. The ceiling of 12.238 percent is at St. Ann, on top of ADIE/St. Charles Rock Road CID, St. Charles Rock Road TDD and St. Ann City Wide TDD. That ceiling comes from a community improvement district and a transportation development district, which in Missouri can cover a single shopping center or one development rather than a whole city, so most addresses pay less. Missouri's address level rate map is required by RSMo 32.310 and is operated for the Department of Revenue on a vendor domain, which is the map dor.mo.gov itself links.
How do I find the exact rate for an address in St. Louis County?
Because the rate changes within the county, an address is the only way to get it right. Use Missouri's own lookup, which the state designates for this purpose and has operated on its behalf by an outside provider. A vendor's calculator is not the state speaking.
Who has to collect sales tax in St. Louis County?
A seller with a physical presence in Missouri collects at the rate for the address where the sale takes place. A remote seller collects once it passes Missouri's economic nexus threshold, which is a separate question from the rate and is covered on our sales tax nexus checker. Marketplace facilitators generally collect on behalf of their sellers.
How does St. Louis County compare?
See Missouri sales tax for the statewide picture, including the average local rate and what is exempt. Property tax is a separate tax with separate rules: property tax in St. Louis County.
Sources
- St. Louis County rates: Missouri Department of Revenue, Sales and Use Tax Rate Tables for July, August, September 2026 (third quarter 2026, updated 5/22/2026), https://dor.mo.gov/pdf/rates/2026/july2026.xlsx, read together with the DOR Jurisdiction and Total Rate Database Q3 2026 and the DOR Rate Database Q3 2026, https://dor.mo.gov/taxation/business/tax-types/sales-use/documents/dor-rate-database-q3-2026.xlsx
- Collected and verified September 9, 2026. Confidence: P on the rate components, P on the range (P read on a primary agency page, S strong but indirect, U unverified).