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Single Family ResidenceResidential
$540,561$288 / 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 91How 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

413 PORPOISE LN

RIVA, MD 21140
2
Baths
1,880 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1970
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$541K
$494K low$587K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,138 (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.$431,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$231,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$199,400
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$411,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$431,100

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.5
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
15
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
9
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
StyleThe architectural style of the home, such as ranch or colonial.Split Level
CountyANNE ARUNDEL
Lot (acres)The size of the land the home sits on, from county records.0.26
RoofThe main material covering the roof, such as asphalt shingle or tile.Composition Shingle
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
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.Porch · 220 ft²

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

E
Central Elementary SchoolB+
Elementary · Grades KG–5 · 2.2 mi
H
South River High SchoolA-
High · Grades 9–12 · 2.5 mi
M
Central Middle SchoolA-
Middle · Grades 6–8 · 2.7 mi

District: Anne Arundel County Public Schools

Neighborhood · ZIP 21140These 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.106
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.34

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.96%
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.1.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.2,741
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,547 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$138,675
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$180,517
Average tempThe average temperature here across a full year.57°F
Annual precipHow much rain and melted snow falls here in a typical year.45 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

413 Porpoise 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 less than 68% of homes in Riva 21140
  • Smaller than 65% of homes in Riva 21140
  • Older than 71% of homes in Riva 21140

What homes are worth in Riva 21140

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

This home
$301K$1.6M

This home is worth more than 32% of homes in Riva 21140.

How it measures up in Riva 21140

The dot is this home. The mark in the middle is the typical home in Riva 21140.

Estimated value$540,561
CheaperTypical $653,777Pricier

Pricier than 32% of homes nearby

Price per ft²$288
CheaperTypical $303Pricier

Pricier than 38% of homes nearby

Living area1,880 ft²
SmallerTypical 2,226 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.26 ac
SmallerTypical 0.28 acBigger

Bigger than 44% of homes nearby

Year built1970
OlderTypical 1979Newer

Newer than 29% of homes nearby

How 413 Porpoise Ln ranks against every home in each area.
MeasureThis homeRiva 21140Anne Arundel County
Estimated valuepricier than$540,56132% of homes57% of homes
Price per ft²pricier than$28838% of homes61% of homes
Living areabigger than1,880 ft²35% of homes51% of homes
Lot sizebigger than0.26 ac44% of homes63% of homes
Year builtnewer than197029% of homes32% of homes

About 413 Porpoise Ln

How much is 413 Porpoise Ln, Riva, MD worth?

The TopHap Estimate for 413 Porpoise Ln, Riva, MD is $540,561 as of Aug 30, 2026. The likely range is $494,282 to $586,840. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 413 Porpoise Ln, Riva, MD last sell?

413 Porpoise Ln, Riva, MD last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 413 Porpoise Ln, Riva, MD?

413 Porpoise Ln, Riva, MD has 2 bathrooms, 1,880 square feet of living space and a 0.26-acre lot.

When was 413 Porpoise Ln, Riva, MD built?

413 Porpoise Ln, Riva, MD was built in 1970, making it 56 years old. It is a split level home. The building has 2 stories.

What schools serve 413 Porpoise Ln, Riva, MD?

413 Porpoise Ln, Riva, MD is assigned to Central Elementary School (elementary), rated B+; South River High School (high), rated A-; Central Middle School (middle), rated A-. All sit in Anne Arundel County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 413 Porpoise Ln, Riva, MD compare to other homes in Riva 21140?

Among the 1,438 homes in Riva 21140, it is worth more than 32% of them ($540,561 against a typical $653,777), its price per square foot is higher than 38% of them ($288 against a typical $303), it is bigger than 35% of them (1,880 ft² against a typical 2,226 ft²), its lot is bigger than 44% of them (0.26 ac against a typical 0.28 ac) and it is newer than 29% of them (1970 against a typical 1979). Measured against all of Anne Arundel County, it is worth more than 57% 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 413 Porpoise Ln, Riva, MD?

The 2025 property tax bill for 413 Porpoise Ln, Riva, MD was $3,138. The county assessed it at $431,100.

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