St. Charles County, Missouri Property Taxes

Name: Property Tax Bills Across St. Charles County, Missouri
Creator: Ownwell
License: https://creativecommons.org/licenses/by-nc/4.0/

Median St. Charles County effective property tax rate: 1.08%, slightly higher than the national median of 1.02%.
Median St. Charles County home value: $293,699
Median annual St. Charles County tax bill: $3,174, $774 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.

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 March 1, 2025

St. Charles County, Missouri Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.08%

Estimate Property Tax Bill

$3,172

$2,943

Ownwell’s St. Charles County Property Tax Bill Calculator empowers homeowners, real estate investors, and potential buyers to estimate their annual property taxes in St. Charles County with just two data points. By entering your property's estimated assessed value, our calculator applies St. Charles County’s median effective tax rate to accurately estimate your property tax bill. Note that your property's assessed value — determined by your county — reflects any exemptions you may have, ensuring a more precise calculation for your property tax obligations. This insightful tool helps you understand potential tax liabilities and highlights how Ownwell can assist in reducing property taxes in St. Charles County. For those interested in more localized information, please scroll down to explore city-level trends!

Property Tax Rates Across St. Charles County, Missouri

Local government entities set tax rates, which can vary widely within a state. This variance is primarily because each county annually estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate. While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process. In St. Charles County, Missouri, the effective property tax rate showcases this variability. The county's rate is slightly above the national median of 1.02%. In comparison, St. Peters has the highest median tax rate in the area, while Augusta boasts the lowest. These differences highlight the diverse fiscal needs and property values within the county. Understanding these rates can provide valuable insights for property owners, especially when considering tax appeal and exemption services.

Property Tax Rates Across St. Charles County, Missouri

Source: Ownwell

0.94%

1.08%

1.23%

Our median effective property tax rate (tax bill ÷ 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

1.08%

Median Effective Missouri Tax Rate

1.20%

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	0.87%	0.91%	0.94%	1.00%	1.03%
Defiance	0.87%	0.91%	0.95%	0.99%	1.05%
Foristell	0.91%	0.97%	1.03%	1.11%	1.14%
Lake Saint Louis	0.97%	1.02%	1.06%	1.13%	1.19%
Lake St Louis	1.02%	1.03%	1.03%	1.11%	1.18%
Marthasville	0.85%	0.93%	0.96%	1.00%	1.13%
New Melle	0.91%	0.96%	0.98%	1.02%	1.20%
Ofallon	1.12%	1.14%	1.14%	1.16%	1.28%
O Fallon	0.99%	1.04%	1.08%	1.14%	1.20%
Portage Des Sioux	0.96%	1.03%	1.11%	1.15%	1.29%
Saint Charles	0.95%	0.99%	1.05%	1.10%	1.18%
Saint Peters	1.01%	1.08%	1.13%	1.18%	1.23%
St Peters	1.09%	1.16%	1.23%	1.31%	1.40%
Weldon Spring	0.95%	0.98%	1.03%	1.06%	1.11%
Wentzville	1.01%	1.08%	1.13%	1.19%	1.24%
West Alton	0.98%	1.19%	1.19%	1.20%	1.44%
Cottleville	N/A	N/A	N/A	N/A	N/A
Dardenne Prairie	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's Office 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 the spring each year. They’ll typically reach your mailbox by the middle of April. 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. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in St. Charles County. For example, the median tax bill in St. Charles County is $2,450, with tax bills ranging significantly across the county. Lake St. Louis has the highest median home price at $760,472.

Property Tax Assessment Values Across St. Charles County, Missouri

Source: Ownwell

$10,000

$385,236

$760,472

Median St. Charles County Market Value

$293,699

Median Missouri Market Value

$129,505

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	$122,916	$192,962	$335,103	$514,728	$653,883
Defiance	$207,636	$343,116	$465,447	$606,818	$803,059
Foristell	$102,537	$249,752	$336,534	$497,166	$655,378
Lake Saint Louis	$218,492	$278,480	$365,254	$461,132	$591,833
Lake St Louis	$266,619	$699,850	$760,472	$808,838	$932,164
Marthasville	$113,016	$248,157	$333,356	$452,542	$603,016
New Melle	$191,648	$248,652	$399,151	$489,725	$616,637
Ofallon	$57,486	$57,486	$57,486	$360,131	$752,802
O Fallon	$189,755	$239,697	$310,694	$385,458	$474,298
Portage Des Sioux	$26,273	$88,590	$136,069	$200,110	$255,558
Saint Charles	$162,925	$212,398	$280,191	$356,237	$443,938
Saint Peters	$162,353	$218,062	$260,998	$321,000	$400,915
St Peters	$8,235	$22,468	$80,039	$261,897	$341,428
Weldon Spring	$227,230	$376,111	$489,381	$645,866	$803,543
Wentzville	$200,453	$259,844	$316,806	$393,348	$485,722
West Alton	$3,330	$8,000	$10,000	$85,004	$148,422
Cottleville	N/A	N/A	N/A	N/A	N/A
Dardenne Prairie	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Bills Across St. Charles County, Missouri

In St. Charles County, MO, property tax bills are determined by assessing the property's market value and applying the local tax rate. The median home price in the county is $293,699, which serves as a benchmark for calculating taxes. Homeowners in this area experience a range of tax bills, with the 25th percentile at $2,450 and the 75th percentile at $4,074. The 90th percentile sees tax bills as high as $5,174. These figures reflect the variance in property values and local tax rates within the county. In Lake St. Louis, the highest median tax bill is a substantial $8,050, while West Alton residents enjoy the lowest at just $119. Compared to the national median property tax rate of 1.02% and a median tax bill of $2,400, St. Charles County presents a diverse landscape for property taxes. Homeowners must consider these factors when budgeting for their annual expenses, as property taxes significantly impact overall housing costs and affordability.

Property Tax Bills Across St. Charles County, Missouri

Source: Ownwell

$119

$4,085

$8,050

Median St. Charles County Tax Bill

$3,174

Median Missouri Tax Bill

$1,606

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	$1,243	$1,851	$3,092	$4,746	$6,058
Defiance	$1,798	$3,160	$4,317	$5,691	$7,897
Foristell	$2,035	$2,596	$3,655	$5,327	$7,005
Lake Saint Louis	$2,120	$2,856	$3,828	$5,008	$6,442
Lake St Louis	$2,776	$7,565	$8,050	$8,611	$9,580
Marthasville	$1,200	$2,183	$3,062	$4,169	$5,873
New Melle	$1,898	$2,387	$3,902	$4,400	$5,369
Ofallon	$656	$656	$656	$3,799	$9,353
O Fallon	$2,028	$2,603	$3,391	$4,154	$5,078
Portage Des Sioux	$338	$967	$1,529	$2,201	$2,700
Saint Charles	$1,732	$2,217	$2,900	$3,714	$4,804
Saint Peters	$1,792	$2,447	$2,964	$3,612	$4,521
St Peters	$109	$310	$873	$2,877	$3,698
Weldon Spring	$2,309	$3,670	$4,952	$6,578	$8,312
Wentzville	$2,168	$2,897	$3,597	$4,446	$5,526
West Alton	$42	$96	$119	$1,039	$1,740
Cottleville	N/A	N/A	N/A	N/A	N/A
Dardenne Prairie	N/A	N/A	N/A	N/A	N/A

Source: Ownwell