St. Mary's County, MD Property Tax Rate
Homeowners in St. Mary's County pay an effective 0.87% of home value in property tax — about $3,401 a year on the median $390,900 home, below or near the Maryland county median of 0.94%.
St. Mary's County, MD: 0.87% effective property tax — ~$3,401/yr on the median home.
- Effective rate0.87%
- Median home value$390,900
- Median annual bill$3,401
- MD county median0.94%
- U.S. county median0.84%
Source: U.S. Census ACS 2023 5-year (median taxes paid ÷ median value), compiled June 2026.
St. Mary's County vs. Maryland and the U.S.
| Effective rate | On the county's $390,900 median home | |
|---|---|---|
| St. Mary's County | 0.87% | $3,401 |
| Maryland county median | 0.94% | $3,674 |
| U.S. county median | 0.84% | $3,284 |
Median household income here is $114,580, putting the median tax bill at about 3.0% of income. Effective rates fold in homestead exemptions and assessment practice — they're what owners actually pay, which is why they beat statutory rates for comparison.
Highest & lowest rates in Maryland
| County | Effective rate | Median bill |
|---|---|---|
| Baltimore County | 1.48% | $3,246 |
| Howard County | 1.18% | $6,805 |
| Prince George's County | 1.15% | $4,649 |
| Baltimore County | 1.10% | $3,630 |
| Talbot County | 0.66% | $2,629 |
| Worcester County | 0.76% | $2,646 |
| Queen Anne's County | 0.79% | $3,490 |
| Garrett County | 0.83% | $1,801 |
Full picture: Maryland property tax calculator · interactive county atlas · all county pages.
Frequently asked questions
What is the property tax rate in St. Mary's County, MD?
The effective rate is about 0.87% of home value — the median homeowner pays roughly $3,401 a year on a $390,900 median home (ACS 2023 five-year data).
Is St. Mary's County's property tax high?
It's below or near the Maryland county median (0.94%) and above the U.S. county median (0.84%).
How is the effective rate calculated?
Median real-estate taxes paid ÷ median home value, from the Census American Community Survey — what owners actually pay, after exemptions, rather than the statutory millage.
Sources & methodology
Sources: Census ACS 2023 5-year tables B25103/B25077.
Effective rate = median real-estate taxes ÷ median home value (owner-occupied). Individual bills vary with exemptions, assessment timing and local levies — verify with the county assessor.