Home and mortgage
St. Mary's County, MD Property Tax Calculator
St. Mary's County homeowners pay a median $3,424 a year in property tax, 0.84% of a median $407,600 home: below Maryland's 0.97% and the national 0.94%.
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Property tax in St. Mary's County by home value, at 0.84%
| Home value | A year | A month |
|---|---|---|
| $200,000 | $1,680 | $140 |
| $310,000 | $2,604 | $217 |
| $410,000 | $3,444 | $287 |
| $610,000 | $5,124 | $427 |
| $820,000 | $6,888 | $574 |
St. Mary's County against Maryland and the US
| Effective rate | Median tax | Median home value | Median household income | |
|---|---|---|---|---|
| St. Mary's County | 0.84% | $3,424 | $407,600 | $119,446 |
| Maryland | 0.97% | $4,093 | $419,900 | $103,678 |
| United States | 0.94% | $3,119 | $332,700 | $80,734 |
How this calculator works
Median real estate taxes paid ÷ median home value in St. Mary's County, from the Census Bureau's American Community Survey 2020–2024 5-year estimates. The calculator starts at the county's median home value and rate.
Questions people ask
What is the property tax rate in St. Mary's County?
The effective rate is 0.84%: a median $3,424 a year on a median $407,600 home. That's the 15th highest of the 18 Maryland counties we cover.
How much is property tax on a $400,000 house in St. Mary's County?
About $3,360 a year, $280 a month, at the county's effective rate, before any exemption.
How does St. Mary's County compare with the rest of Maryland?
Its rate is below the state's 0.97%. Across Maryland, covered counties range from 0.73% to 1.46%.
How do I lower my St. Mary's County property tax?
Apply for every exemption you qualify for, such as a homestead exemption, and appeal your assessment if it is higher than comparable homes sold nearby; the county assessor explains the deadlines.
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Updated by the RateHerald team. The maths is tested against worked examples; report a problem.