Missouri Sales Tax Rates: Washington County
Washington County, Missouri Sales Tax Rate 2026 Up to 9.225%
A county-wide sales tax rate of 2% is applicable to localities in Washington County, in addition to the 4.225% Missouri sales tax.
Some cities and local governments in Washington County collect additional local sales taxes, which can be as high as 3%.Here's how Washington County's maximum sales tax rate of 9.225% compares to other counties around the United States:
- Lower maximum sales tax than 52% of Missouri counties
- Higher maximum sales tax than 80% of counties nationwide
Tax Rates By City in Washington County, Missouri
The total sales tax rate in any given location can be broken down into state, county, city, and special district rates. Missouri has a 4.225% sales tax and Washington County collects an additional 2%, so the minimum sales tax rate in Washington County is 6.225% (not including any city or special district taxes). This table shows the total sales tax rates for all cities and towns in Washington County, including all local taxes.
| City | Sales Tax Rate | Tax Jurisdiction |
|---|---|---|
| Potosi | 9.225% | Potosi |
| Cadet | 7.225% | Potosi Fire Protection District |
| Mineral Point | 9.225% | Potosi |
| Irondale | 8.225% | Irondale |
| Richwoods | 7.225% | Potosi Fire Protection District |
| Belgrade | 7.225% | Potosi Fire Protection District |
| Blackwell | 7.225% | Potosi Fire Protection District |
| Caledonia | 7.725% | Caledonia |
| Fletcher | 6.85% | Jefferson Co Valle Ambulance District Sp |
| Tiff | 7.225% | Potosi Fire Protection District |
Missouri Sales Tax Rates by Zip Code:
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Washington County, Missouri has a maximum sales tax rate of 9.225% and an approximate population of 16,142.
Sales tax rates in Washington County are determined by five different tax jurisdictions, Caledonia, Irondale, Jefferson Co Valle Ambulance District Sp, Potosi and Potosi Fire Protection District.
Back to Missouri Sales Tax Handbook Sales tax rates for Washington County are current as of June 2026
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