Property Taxes in Great Mills, Maryland
Median Great Mills, Maryland effective property tax rate: 0.91%, significantly lower than the national median of 1.02%, and lower than the Maryland state median of 1.21%.
Median Great Mills, Maryland home value: $309,100
Median annual Great Mills, Maryland tax bill: $2,822, $422 higher than the national median property tax bill of $2,400.
How are property taxes in St. Mary's calculated?
Property taxes in Great Mills, Maryland 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 Great Mills's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Great Mills, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Great Mills Property Tax Calculator Work?
Use this Great Mills property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Great Mills's median effective tax rate of 0.91% — based on actual property records in St. Mary's County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment office uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Great Mills's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within Great Mills: rates range from 0.91% in 20634 to 0.91% in 20634, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Great Mills.
About Great Mills Property Taxes
About Property Taxes in Great Mills, St. Mary's, Maryland
Great Mills's median effective property tax rate of 0.91% is lower than the Maryland state median of 1.21% and lower than the national median of 1.02%. This rate reflects the St. Mary's County base levy combined with local school district levies and special taxing districts that vary by subdivision throughout the city.
Property tax rates are not uniform across Great Mills. Homeowners in the 20634 ZIP code carry a median effective rate of 0.91%, while those in 20634 pay 0.91%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across St. Mary's County. Understanding which part of Great Mills you live in can make a meaningful difference to your annual tax bill.
Great Mills homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the February 13, 2026 deadline each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Great Mills, St. Mary's County, Maryland
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county 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.
Below, you can compare Great Mills's effective property tax rate to other cities in Maryland and the median property tax rates in Maryland and the U.S.
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 Great Mills Tax Rate
0.91%
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. Mary's County Tax Rate
1.00%
Median Effective Maryland Tax Rate
1.21%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Great Mills, St. Mary's County, Maryland
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 20634 | 0.82% | 0.87% | 0.91% | 0.95% | 1.01% |
Source: Ownwell
Property Tax Assessment Values Across Great Mills, St. Mary's County, Maryland
When examining property taxes in Great Mills, Maryland, 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. Mary's County appraisal district 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. Mary's County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of December.
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 Great Mills.
For example, the median home price in Great Mills is $309,100, with tax bills ranging significantly across the county. 20634 has the highest median home price at $309,100.
Property Tax Assessment Values Across Great Mills, St. Mary's County, Maryland
Source: Ownwell
$243,700
$385,275
$526,850
Median Great Mills Market Value
$309,100
Median St. Mary's County Market Value
$332,600
Median Maryland Market Value
$338,400
Median United States Market Value
$274,101
Property Tax Assessment Values Across Great Mills, St. Mary's County, Maryland
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 20634 | $190,000 | $235,300 | $309,100 | $380,800 | $452,520 |
Source: Ownwell
Property Tax Bills Across Great Mills, St. Mary's County, Maryland
Great Mills property tax bills are based on the assessed value of a home and the local tax rate set for St. Mary's County. The assessed value is the starting point for the calculation, so when a home’s market value changes, the tax bill can change too. For a home with a median price of $309,100, property taxes are a meaningful part of ownership costs.
In Great Mills, the median property tax bill is $2,822, which is above the national median property tax bill of $2,400. That means many homeowners here pay more than the typical U.S. homeowner, even before considering differences in home value or tax rates. Bills can vary widely: the 25th percentile is $2,090, while the 75th percentile is $3,425 and the 90th percentile reaches $4,069. These differences show how the tax bill depends on both the assessed value of the property and the local tax structure, which can affect monthly housing costs and overall affordability for homeowners.
Median Great Mills Tax Bill
$2,822
Median St. Mary's County Tax Bill
$3,276
Median Maryland Tax Bill
$4,092
Median United States Tax Bill
$3,209
Property Tax Bills Across Great Mills, St. Mary's County, Maryland
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 20634 | $1,708 | $2,090 | $2,822 | $3,425 | $4,069 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | February 13 |
Links | |
|---|---|
| St. Mary's Tax Assessor | |
| Website | sdat.dat.maryland.gov |