St. Charles County, Missouri Property Taxes
Property Taxes in St. Charles County, Missouri
Median St. Charles County effective property tax rate: 1.26%, significantly higher than the national median of 1.02%.
Median St. Charles County home value: $292,700
Median annual St. Charles County tax bill: $3,678, higher than the national median property tax bill of $2,400.
How are property taxes in St. Charles County calculated?
Property taxes in St. Charles County are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Why are property taxes in St. Charles County higher than the national median?
The median effective property tax rate in St. Charles County is 1.26%, which is above the national median of 1.02%. That helps explain why the median annual tax bill is $3,678, compared with the national median of $2,400.
How do local exemptions affect your property tax bill?
Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in St. Charles or another part of St. Charles County, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
St. Charles County, Missouri Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.26%
Estimate Property Tax Bill
$3,688
$3,422
How Does the St. Charles County Property Tax Calculator Work?
Use this St. Charles County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies St. Charles County's median effective tax rate of 1.26% to generate your estimate.
Enter your property's estimated assessed value — the figure used for tax purposes, which is typically lower than market value after applicable exemptions. Our calculator uses the median effective rate for a more accurate estimate than the statutory millage rate alone.
Your actual bill may vary based on your specific exemptions, local school district levies, and any special assessment districts that apply to your property. St. Charles County’s median tax rate is higher than Missouri’s 1.25% median, and the county’s median tax bill of $3,678 is $1,278 higher than the state median and well above the $2,400 national median property tax bill.
For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across St. Charles County.
Property Tax Rates Across St. Charles County, Missouri
What Are Effective Property Tax Rates Across St. Charles County?
Local government entities set tax rates, which vary widely across St. Charles County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.
Below, compare St. Charles County's effective property tax rate to other counties in Missouri or the U.S. median of 1.02%.
St. Charles County's median effective rate stands at 1.26%, which is higher than the national median of 1.02%. Within St. Charles County, the highest rate is found in Saint Peters at 1.33%, while Augusta has the lowest at 1.09%.
These variations reflect differences in local school district levies, special assessment districts assessments, and special district bonds — which compound the base county rate.
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective St. Charles County Tax Rate
1.26%
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Missouri Tax Rate
1.25%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across St. Charles County, Missouri
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Augusta | 1.09% | 1.09% | 1.09% | 1.13% | 1.13% |
| Dardenne Prairie | 1.21% | 1.22% | 1.22% | 1.22% | 1.22% |
| Defiance | 1.09% | 1.12% | 1.12% | 1.12% | 1.12% |
| Foristell | 1.12% | 1.20% | 1.20% | 1.20% | 1.23% |
| Lake Saint Louis | 1.25% | 1.29% | 1.30% | 1.31% | 1.31% |
| Lake St Louis | 1.28% | 1.30% | 1.30% | 1.30% | 1.30% |
| Marthasville | 1.12% | 1.12% | 1.12% | 1.16% | 1.17% |
| New Melle | 1.12% | 1.19% | 1.19% | 1.19% | 1.19% |
| Ofallon | 1.19% | 1.24% | 1.24% | 1.24% | 1.30% |
| O Fallon | 1.18% | 1.22% | 1.26% | 1.26% | 1.30% |
| Portage Des Sioux | 1.16% | 1.20% | 1.29% | 1.34% | 1.36% |
| Saint Charles | 1.13% | 1.14% | 1.18% | 1.22% | 1.28% |
| Saint Peters | 1.18% | 1.26% | 1.33% | 1.35% | 1.36% |
| St Peters | 1.16% | 1.22% | 1.31% | 1.34% | 1.34% |
| Weldon Spring | 1.13% | 1.13% | 1.13% | 1.13% | 1.14% |
| Wentzville | 1.20% | 1.31% | 1.31% | 1.31% | 1.31% |
| West Alton | 1.16% | 1.16% | 1.16% | 1.27% | 1.57% |
| Cottleville | N/A | N/A | N/A | N/A | N/A |
| Saint Paul | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across St. Charles County, Missouri
When examining property taxes in St. Charles County, understanding the distinction between “market value” and “assessed value” is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The St. Charles County assessor estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In St. Charles County, assessment notices are sent in April each year.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. The median tax bill in St. Charles County is $3,678, compared with the national median property tax bill of $2,400. Tax bills range significantly across the county, with Lake St. Louis reaching a median home price of $769,710 and a median tax bill of $10,027, while West Alton has the lowest median tax bill at $116.
Property Tax Assessment Values Across St. Charles County, Missouri
Source: Ownwell
$10,000
$389,855
$769,710
Median St. Charles County Market Value
$292,700
Median Missouri Market Value
$136,526
Median United States Market Value
$235,294
Property Tax Assessment Values Across St. Charles County, Missouri
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Augusta | $113,139 | $187,167 | $332,261 | $512,284 | $651,891 |
| Dardenne Prairie | $30,000 | $30,000 | $30,000 | $153,518 | $418,274 |
| Defiance | $196,584 | $337,648 | $463,622 | $605,646 | $804,422 |
| Foristell | $75,000 | $237,677 | $324,723 | $486,843 | $647,792 |
| Lake Saint Louis | $212,207 | $275,661 | $363,749 | $459,927 | $591,764 |
| Lake St Louis | $203,989 | $699,850 | $769,710 | $810,453 | $932,164 |
| Marthasville | $109,585 | $246,228 | $333,356 | $450,632 | $602,969 |
| New Melle | $390,869 | $398,747 | $432,472 | $568,388 | $624,409 |
| Ofallon | $57,486 | $57,486 | $57,486 | $360,131 | $752,802 |
| O Fallon | $186,182 | $237,823 | $309,554 | $384,714 | $473,838 |
| Portage Des Sioux | $24,198 | $87,680 | $135,963 | $199,969 | $254,916 |
| Saint Charles | $157,364 | $210,568 | $279,140 | $355,776 | $444,190 |
| Saint Peters | $161,867 | $217,851 | $260,881 | $320,906 | $400,920 |
| St Peters | $7,557 | $19,476 | $50,004 | $121,086 | $358,445 |
| Weldon Spring | $227,320 | $376,190 | $489,334 | $645,943 | $803,498 |
| Wentzville | $188,524 | $256,488 | $315,200 | $392,031 | $484,356 |
| West Alton | $3,323 | $8,000 | $10,000 | $85,311 | $148,803 |
| Cottleville | N/A | N/A | N/A | N/A | N/A |
| Saint Paul | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across St. Charles County, Missouri
Property tax bills in St. Charles are based on the assessed value of a home, not its market price alone. Local taxing authorities apply tax rates to that assessed value to determine the final bill, so two homes with similar market values can still owe different amounts if their assessments or tax rates differ.
Several factors shape the amount homeowners pay, including the home’s assessed value, local levies, and where the property is located within the county. The median home price is $292,700, but tax bills can vary widely from one area to another. In St. Charles, the 25th percentile tax bill is $2,874, while the 75th percentile tax bill is $4,694 and the 90th percentile tax bill is $5,922.
That variation can have a real impact on monthly housing costs and long-term affordability. Some homeowners may pay far less than the county’s higher-end bills, while others, especially in places like Lake St. Louis, may face much larger tax burdens.
Median St. Charles County Tax Bill
$3,678
Median Missouri Tax Bill
$1,684
Median United States Tax Bill
$2,400
Property Tax Bills Across St. Charles County, Missouri
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Augusta | $1,287 | $2,118 | $3,654 | $5,646 | $7,116 |
| Dardenne Prairie | $366 | $366 | $366 | $2,117 | $5,261 |
| Defiance | $2,274 | $3,871 | $5,282 | $6,815 | $8,980 |
| Foristell | $2,149 | $3,025 | $3,970 | $5,860 | $7,830 |
| Lake Saint Louis | $2,850 | $3,601 | $4,718 | $5,944 | $7,710 |
| Lake St Louis | $2,457 | $9,121 | $10,027 | $10,558 | $12,137 |
| Marthasville | $1,312 | $2,809 | $3,829 | $5,121 | $6,743 |
| New Melle | $4,536 | $4,746 | $5,138 | $6,781 | $7,449 |
| Ofallon | $633 | $715 | $715 | $4,685 | $9,364 |
| O Fallon | $2,384 | $3,024 | $3,890 | $4,783 | $5,811 |
| Portage Des Sioux | $308 | $1,104 | $1,758 | $2,550 | $3,218 |
| Saint Charles | $1,968 | $2,568 | $3,352 | $4,264 | $5,451 |
| Saint Peters | $2,067 | $2,831 | $3,422 | $4,190 | $5,144 |
| St Peters | $101 | $244 | $1,050 | $1,716 | $4,722 |
| Weldon Spring | $2,576 | $4,260 | $5,538 | $7,300 | $9,046 |
| Wentzville | $2,567 | $3,377 | $4,122 | $5,096 | $6,261 |
| West Alton | $41 | $92 | $116 | $1,195 | $2,045 |
| Cottleville | N/A | N/A | N/A | N/A | N/A |
| Saint Paul | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | July 13 |
Links | |
|---|---|
| St. Charles Tax Assessor | |
| Website | mo-stcharles-assessor.publicaccessnow.com |