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Single Family ResidenceResidential
$499,186$187 / 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 97How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $385,000 on Aug 14, 2020

23121 ALDER LN

CALIFORNIA, MD 20619
3.5
Baths
2,664 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.
0.47 ac
Lot SizeThe size of the land the home sits on, from county records.
1987
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$499K
$483K low$516K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$385,000 · Aug 14, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,958 (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.$407,400 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$112,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$295,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$390,533
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$407,400

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.42
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
24
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
81
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
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.Single Family Residence
CountyST. MARY'S
Lot (acres)The size of the land the home sits on, from county records.0.47
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.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Mixed
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.Deck · 190 ft²Porch · 161 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.

E
Evergreen Elementary SchoolA-
Elementary · Grades PK–5 · 1.2 mi
M
Esperanza Middle SchoolB
Middle · Grades 6–8 · 2.9 mi
H
Leonardtown High SchoolB+
High · Grades 9–12 · 4.4 mi

District: St. Marys County Public Schools

Neighborhood · ZIP 20619These 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.101
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 100.29

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.11,563
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.653 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$123,149
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$137,316
Average tempThe average temperature here across a full year.57°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%

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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

23121 Alder Ln 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 more than 76% of homes in California 20619
  • Costs less per square foot than 84% of homes in St. Mary's County
  • Bigger than 85% of homes in California 20619
  • Has a bigger lot than 74% of homes in California 20619
  • Older than 74% of homes in California 20619

What homes are worth in California 20619

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

This home
$191K$737K

This home is worth more than 76% of homes in California 20619.

How it measures up in California 20619

The dot is this home. The mark in the middle is the typical home in California 20619.

Estimated value$499,186
CheaperTypical $402,688Pricier

Pricier than 76% of homes nearby

Price per ft²$187
CheaperTypical $220Pricier

Pricier than 20% of homes nearby

Living area2,664 ft²
SmallerTypical 1,848 ft²Bigger

Bigger than 85% of homes nearby

Lot size0.47 ac
SmallerTypical 0.17 acBigger

Bigger than 74% of homes nearby

Year built1987
OlderTypical 2003Newer

Newer than 26% of homes nearby

How 23121 Alder Ln ranks against every home in each area.
MeasureThis homeCalifornia 20619St. Mary's County
Estimated valuepricier than$499,18676% of homes67% of homes
Price per ft²pricier than$18720% of homes16% of homes
Living areabigger than2,664 ft²85% of homes82% of homes
Lot sizebigger than0.47 ac74% of homes39% of homes
Year builtnewer than198726% of homes41% of homes

About 23121 Alder Ln

How much is 23121 Alder Ln, California, MD worth?

The TopHap Estimate for 23121 Alder Ln, California, MD is $499,186 as of Oct 21, 2026. The likely range is $482,539 to $515,833. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 23121 Alder Ln, California, MD last sell?

23121 Alder Ln, California, MD last sold on Aug 14, 2020 for $385,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 23121 Alder Ln, California, MD?

23121 Alder Ln, California, MD has 3.5 bathrooms, 2,664 square feet of living space and a 0.47-acre lot.

When was 23121 Alder Ln, California, MD built?

23121 Alder Ln, California, MD was built in 1987, making it 39 years old. The building has 2 stories.

What schools serve 23121 Alder Ln, California, MD?

23121 Alder Ln, California, MD is assigned to Evergreen Elementary School (elementary), rated A-; Esperanza Middle School (middle), rated B; Leonardtown High School (high), rated B+. All sit in St. Marys County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 23121 Alder Ln, California, MD compare to other homes in California 20619?

Among the 6,005 homes in California 20619, it is worth more than 76% of them ($499,186 against a typical $402,688), its price per square foot is higher than 20% of them ($187 against a typical $220), it is bigger than 85% of them (2,664 ft² against a typical 1,848 ft²), its lot is bigger than 74% of them (0.47 ac against a typical 0.17 ac) and it is newer than 26% of them (1987 against a typical 2003). Measured against all of St. Mary's County, it is worth more than 67% 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 23121 Alder Ln, California, MD?

The 2025 property tax bill for 23121 Alder Ln, California, MD was $3,958. The county assessed it at $407,400.

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