The typical owner-occupied home in St. Mary's County is worth about $407,600, 3% below the Maryland median of $419,900 and 23% above the national median of $332,700. Owners pay a median $3,424 a year in property taxes, about 0.84% of their home's value, lower than the Maryland rate of 0.97%. The median household earns $119,446 a year, so the median home costs 3.4 times the median income (4.1 times for Maryland). 73% of occupied homes here are lived in by their owners, and 71% of those owners still have a mortgage.
St. Mary's County at a glance
| St. Mary's County | Maryland | U.S. | |
|---|---|---|---|
| Median home value | $407,600 | $419,900 | $332,700 |
| Median property tax paid per year | $3,424 | $4,093 | $3,119 |
| Property tax as a share of value | 0.84% | 0.97% | 0.94% |
| Median household income | $119,446 | $103,678 | $80,734 |
| Homes lived in by their owners | 73% | 68% | 65% |
| Owner homes with a mortgage | 71% | 71% | 61% |
| Median monthly costs, owners with a mortgage | $2,268 | $2,347 | $1,963 |
| Those costs as a share of the owners' income | 18.2% | 20.5% | 21.0% |
| Median rent | $1,747 | $1,705 | $1,413 |
| Rent as a share of renters' income | 27.9% | 30.8% | 30.6% |
| Median year homes were built | 1992 | 1979 | 1980 |
| Vacant homes | 8.5% | 7.7% | 10.1% |
| Population | 115,126 | 6,206,011 | 334,922,499 |
What a typical home costs per month in St. Mary's County
At this week's average 30-year rate of 7.11%, buying the median St. Mary's County home of $407,600 with 20% down costs about $2,649 a month, including property taxes and insurance. With an FHA loan and 3.5% down, it's about $3,328, because the loan is bigger and FHA adds mortgage insurance.
Lenders usually want housing costs under about 28% of gross income, which means an income of roughly $113,516 for the 20%-down payment. That payment is 27% of the median St. Mary's County household income of $119,446; at that income and 20% down, the 28% guideline points to a home of about $429,000.
The median rent here is $1,747 a month, so owning the median home costs about $902 a month more than renting, before you count the equity you build and any tax benefits.
| Down payment | $81,520 |
|---|---|
| Loan amount | $326,080 |
| Principal and interest | $2,194 |
| Property taxes (0.84% a year) | $285 |
| Homeowners insurance (our estimate, 0.5% a year) | $170 |
| PMI | $0 |
| Total per month | $2,649 |
Change the numbers in the calculator
| Down payment | $14,266 |
|---|---|
| Loan amount | $400,217 |
| Principal and interest | $2,692 |
| Property taxes (0.84% a year) | $285 |
| Homeowners insurance (our estimate, 0.5% a year) | $170 |
| FHA mortgage insurance | $180 |
| Total per month | $3,328 |
Change the numbers in the calculator
Questions about home buying in St. Mary's County
What is the median home value in St. Mary's County?
About $407,600 for owner-occupied homes, according to the Census Bureau's 2020–2024 American Community Survey.
How much are property taxes in St. Mary's County?
Homeowners pay a median $3,424 a year, which is about 0.84% of the median home value. Your bill depends on your home's assessed value and local rates.
What income do you need to buy a home in St. Mary's County?
For the median home with 20% down at 7.11%, the payment is about $2,649 a month. Keeping that under 28% of gross income takes about $113,516 a year.
More about St. Mary's County
- Mortgage Refinance in St. Mary's County
- Debt Relief in St. Mary's County
- Home Equity Loans in St. Mary's County
- Guides and quotes for mortgage refinance on our sister site, MortgageRefinance.com
Sources: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates; Freddie Mac Primary Mortgage Market Survey, week of November 12, 2026. Estimates for small places have wide margins of error. About our data