St. Mary's County, MD property tax
Census ACS 2023 5-year estimates · updated 2026-09-20
The median effective property tax rate in St. Mary's County is 0.87%, below the Maryland median of 1.00% and below the national median of 0.98%. The median homeowner pays $3,392 a year on a home worth $390,900.
- Effective rate
- 0.87%
- Median annual bill
- $3,392
- Median home value
- $390,900
- Rank in Maryland
- 19of 24
Estimated annual bill by home value
| Home value | Estimated bill | Per month |
|---|---|---|
| $200,000 | $1,740 | $145 |
| $300,000 | $2,610 | $218 |
| $400,000 | $3,480 | $290 |
| $500,000 | $4,350 | $363 |
| $750,000 | $6,525 | $544 |
| $1,000,000 | $8,700 | $725 |
St. Mary's County compared with Maryland and the US
| Area | Effective rate | Median bill | Median home value |
|---|---|---|---|
| St. Mary's County | 0.87% | $3,392 | $390,900 |
| Maryland median | 1.00% | $3,989 | $397,700 |
| United States median | 0.98% | $2,969 | n/a |
Rates and medians: U.S. Census Bureau, ACS 2023 5-year estimates, tables B25103 and B25077. Effective rate is median taxes paid divided by median owner-occupied home value.
Frequently asked questions
What is the property tax rate in St. Mary's County, MD?
The median effective property tax rate in St. Mary's County is 0.87% of home value, below the Maryland median of 1.00% and below the national median of 0.98%. The median homeowner pays $3,392 a year on a median home value of $390,900 (Census ACS 2023 5-year).
How much is property tax on a $400,000 house in St. Mary's County?
About $3,480 per year at the county's median effective rate of 0.87%, before exemptions. The exact bill depends on the city, school district and special districts that serve the parcel, so treat this as a planning estimate.
How does St. Mary's County compare with the rest of Maryland?
St. Mary's County ranks 19 of 24 Maryland counties by effective rate. The Maryland median is 1.00% and the median bill is $3,989.