Washington County
•
Missouri (MO)
4 ZIP Code
Washington County, MO Sales Tax Rates 2026
2026 sales tax rate guide for Washington County, MO. Average combined tax rate is 7.60% with local jurisdictions ranging up to 8.22%.
Average Combined Rate
7.60%
Estimated Tax Range: 7.22% - 8.22%
⚡ Direct Tax Answer & Key Takeaway
As of 2026, the local county sales tax rate in Washington County (Missouri) is 2.00%. Combined sales tax rates across cities in this county range from 7.22% to 8.22% (averaging 7.60%).
County Tax
2.00%
Average Combined Rate
7.60%
Max Local Rate
8.22%
Indexed Cities
4
Cities & Towns in Washington County
| City | Combined Sales Tax Rate | Action |
|---|---|---|
| Potosi | 8.22% | View Tax Rates → |
| Irondale | 7.72% | View Tax Rates → |
| Mineral Point | 7.22% | View Tax Rates → |
| Caledonia | 7.22% | View Tax Rates → |
📋 State Tax Rules & Compliance Guide
Sourcing Rule:
Destination-based
Groceries & Food:
Exempt (0% Tax)
Clothing & Apparel:
Taxable at standard rate
SaaS & Digital Goods:
Non-Taxable
Economic Nexus Threshold:
$100,000 in sales or 200 separate transactions
Official Tax Authority:
Missouri Department of Revenue ↗
Interactive Sales Tax Calculator
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Address-Specific Rates
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ZIP Codes in Washington County
❓ Frequently Asked Questions
Key questions and answers regarding sales tax rates, exemptions, and compliance.