St. Charles County, MO Property Tax: $3,340/yr (2026)
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The effective property tax rate in St. Charles County is 1.13% of assessed home value. On a home at the county median value of $296,800, that works out to about $3,354 per year, or $280 per month. St. Charles County is located in eastern Missouri, and is home to approximately 409,830 residents.
About St. Charles County
St. Charles County covers approximately 560.5 square miles in Missouri. The county is home to about 409,830 residents living in roughly 164,594 housing units, of which 77.8% are owner-occupied. The median household income is $102,912, and the median home was built in 1994.
St. Charles County borders Calhoun County, Jersey County, Madison County, Franklin County, Lincoln County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Missouri
Property taxes in Missouri are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in Missouri offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the St. Charles County Assessor's office to learn which exemptions apply to your property and when to file.
St. Charles County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| St. Charles County, MO | 1.13% | $296,800 | $3,354 |
| Missouri state average | 0.73% | — | $2,167* |
| Calhoun County | 1.47% | $174,000 | $2,565 |
| Jersey County | 1.75% | $168,800 | $2,957 |
| Madison County | 1.92% | $167,900 | $3,232 |
| Franklin County | 0.83% | $214,900 | $1,774 |
| Lincoln County | 0.77% | $224,800 | $1,731 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at St. Charles County's median home value of $296,800. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does St. Charles County's property tax rate compare to the rest of Missouri?
At 1.13%, St. Charles County is higher than the Missouri state average of 0.73%. On a home at the county median of $296,800, that means about $3,354 per year — versus $2,167 at the state average rate, a difference of $1,187 per year. Compared to the national average of 1.10%, St. Charles County is above average.
What's a typical annual property tax bill in St. Charles County?
For a home at the county median value of $296,800, the annual property tax in St. Charles County is approximately $3,354 — or about $280 per month. For a home worth $445,200, expect around $5,031 per year. For a $593,600 home, approximately $6,708 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a St. Charles County property tax assessment?
Property assessment appeals in St. Charles County are handled by the St. Charles County Assessor's office. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in St. Charles County?
Missouri counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 1.13% shown here. Contact the St. Charles County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File