Skip to content
Skip to content
TopHapOpen in map
TownhouseResidential
$327,005$227 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $234,500 on Sep 22, 2017

309 SAINT MARYS AVE

LA PLATA, MD 20646
2
Baths
1,440 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
2,400 ft²
Lot SizeThe size of the land the home sits on, from county records.
1994
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$327K
$315K low$339K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$234,500 · Sep 22, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,234 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$287,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$80,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$207,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$268,033
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$287,300

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.39
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
17
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
78
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
80
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
23
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Townhouse
StyleThe architectural style of the home, such as ranch or colonial.Townhouse
CountyCHARLES
Lot (acres)The size of the land the home sits on, from county records.0.06
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Heat Pump
CoolingThe type of cooling or air conditioning in the home.Central
PoolWhether the property has a pool, and what kind, such as in-ground.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 180 ft²

Transaction History(3)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

M
Milton M. Somers Middle SchoolC-
Middle · Grades 6–8 · 0.3 mi
E
Walter J. Mitchell Elementary SchoolA-
Elementary · Grades PK–5 · 0.6 mi
H
La Plata High SchoolB
High · Grades 9–12 · 2.2 mi

District: Charles County Public Schools

Neighborhood · ZIP 20646These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.86
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.31

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.23,382
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.280 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$129,154
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,771
Average tempThe average temperature here across a full year.56°F
Annual precipHow much rain and melted snow falls here in a typical year.44 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

Owner Tools

Do you own this home?
Claim this home

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

309 Saint Marys Ave measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth less than 88% of homes in La Plata 20646
  • Costs more per square foot than 68% of homes in Charles County
  • Smaller than 84% of homes in La Plata 20646
  • Has a smaller lot than 88% of homes in La Plata 20646

What homes are worth in La Plata 20646

Each bar is how many homes fall in that price range. The marker is this home.

This home
$257K$869K

This home is worth more than 12% of homes in La Plata 20646.

How it measures up in La Plata 20646

The dot is this home. The mark in the middle is the typical home in La Plata 20646.

Estimated value$327,005
CheaperTypical $465,071Pricier

Pricier than 12% of homes nearby

Price per ft²$227
CheaperTypical $209Pricier

Pricier than 67% of homes nearby

Living area1,440 ft²
SmallerTypical 2,212 ft²Bigger

Bigger than 16% of homes nearby

Lot size2,400 ft²
SmallerTypical 0.76 acBigger

Bigger than 12% of homes nearby

Year built1994
OlderTypical 1992Newer

Newer than 53% of homes nearby

How 309 Saint Marys Ave ranks against every home in each area.
MeasureThis homeLa Plata 20646Charles County
Estimated valuepricier than$327,00512% of homes16% of homes
Price per ft²pricier than$22767% of homes68% of homes
Living areabigger than1,440 ft²16% of homes19% of homes
Lot sizebigger than2,400 ft²12% of homes17% of homes
Year builtnewer than199453% of homes54% of homes

About 309 Saint Marys Ave

How much is 309 Saint Marys Ave, La Plata, MD worth?

The TopHap Estimate for 309 Saint Marys Ave, La Plata, MD is $327,005 as of Aug 30, 2026. The likely range is $315,125 to $338,885. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 309 Saint Marys Ave, La Plata, MD last sell?

309 Saint Marys Ave, La Plata, MD last sold on Sep 22, 2017 for $234,500, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 309 Saint Marys Ave, La Plata, MD?

309 Saint Marys Ave, La Plata, MD has 2 bathrooms, 1,440 square feet of living space and a 0.06-acre lot.

When was 309 Saint Marys Ave, La Plata, MD built?

309 Saint Marys Ave, La Plata, MD was built in 1994, making it 32 years old. It is a townhouse home. The building has 1 story.

What schools serve 309 Saint Marys Ave, La Plata, MD?

309 Saint Marys Ave, La Plata, MD is assigned to Milton M. Somers Middle School (middle), rated C-; Walter J. Mitchell Elementary School (elementary), rated A-; La Plata High School (high), rated B. All sit in Charles County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 309 Saint Marys Ave, La Plata, MD compare to other homes in La Plata 20646?

Among the 8,781 homes in La Plata 20646, it is worth more than 12% of them ($327,005 against a typical $465,071), its price per square foot is higher than 67% of them ($227 against a typical $209), it is bigger than 16% of them (1,440 ft² against a typical 2,212 ft²), its lot is bigger than 12% of them (2,400 ft² against a typical 0.76 ac) and it is newer than 53% of them (1994 against a typical 1992). Measured against all of Charles County, it is worth more than 16% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 309 Saint Marys Ave, La Plata, MD?

The 2025 property tax bill for 309 Saint Marys Ave, La Plata, MD was $8,234. The county assessed it at $287,300.

More homes on Saint Marys Ave

Closest homes

More homes in La Plata 20646

Assigned schools

Explore the area

See this home in context

Open 309 Saint Marys Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map