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Single Family ResidenceResidential
$514,589$400 / 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 Jul 14, 2026
Last sold for $464,000 on Sep 2, 2022

521 CALVIN LN

ROCKVILLE, MD 20851
2
Baths
1,287 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
1953
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$515K
$500K low$529K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$464,000 · Sep 2, 2022
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$143,389
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$114,711
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.72%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$371,200
BUCKINGHAM MORTGAGE LLC · recorded Sep 2, 2022

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,817 (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.$428,133 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$402,667
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$453,600

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.15
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
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

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
Meadow Hall Elementary SchoolC-
Elementary · Grades KG–5 · 0.4 mi
H
Rockville High SchoolB-
High · Grades 9–12 · 0.4 mi
M
Earle B. Wood Middle SchoolB-
Middle · Grades 6–8 · 1.1 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20851These 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.82
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.90
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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.5%
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.13,201
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,514 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$115,758
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$138,170
Average tempThe average temperature here across a full year.54°F
Annual precipHow much rain and melted snow falls here in a typical year.43 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No

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

521 Calvin 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 73% of homes in Rockville
  • Costs more per square foot than 81% of homes in Montgomery County
  • Smaller than 80% of homes in Montgomery County
  • Has a smaller lot than 72% of homes in Rockville 20851
  • Older than 84% of homes in Montgomery County

What homes are worth in Rockville 20851

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

This home
$383K$754K

This home is worth more than 41% of homes in Rockville 20851.

How it measures up in Rockville 20851

The dot is this home. The mark in the middle is the typical home in Rockville 20851.

Estimated value$514,589
CheaperTypical $532,761Pricier

Pricier than 41% of homes nearby

Price per ft²$400
CheaperTypical $359Pricier

Pricier than 72% of homes nearby

Living area1,287 ft²
SmallerTypical 1,479 ft²Bigger

Bigger than 35% of homes nearby

Lot size0.15 ac
SmallerTypical 0.16 acBigger

Bigger than 28% of homes nearby

Year built1953
OlderTypical 1953Newer

Newer than 54% of homes nearby

How 521 Calvin Ln ranks against every home in each area.
MeasureThis homeRockvilleRockville 20851Montgomery County
Estimated valuepricier than$514,58927% of homes41% of homes33% of homes
Price per ft²pricier than$40075% of homes72% of homes81% of homes
Living areabigger than1,287 ft²23% of homes35% of homes20% of homes
Lot sizebigger than0.15 ac47% of homes28% of homes46% of homes
Year builtnewer than195317% of homes54% of homes16% of homes

About 521 Calvin Ln

How much is 521 Calvin Ln, Rockville, MD worth?

The TopHap Estimate for 521 Calvin Ln, Rockville, MD is $514,589 as of Jul 14, 2026. The likely range is $500,340 to $528,838. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 521 Calvin Ln, Rockville, MD last sell?

521 Calvin Ln, Rockville, MD last sold on Sep 2, 2022 for $464,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 521 Calvin Ln, Rockville, MD?

521 Calvin Ln, Rockville, MD has 2 bathrooms, 1,287 square feet of living space and a 0.15-acre lot.

When was 521 Calvin Ln, Rockville, MD built?

521 Calvin Ln, Rockville, MD was built in 1953, making it 73 years old. The building has 1 story.

What schools serve 521 Calvin Ln, Rockville, MD?

521 Calvin Ln, Rockville, MD is assigned to Meadow Hall Elementary School (elementary), rated C-; Rockville High School (high), rated B-; Earle B. Wood Middle School (middle), rated B-. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 521 Calvin Ln, Rockville, MD compare to other homes in Rockville 20851?

Among the 3,658 homes in Rockville 20851, it is worth more than 41% of them ($514,589 against a typical $532,761), its price per square foot is higher than 72% of them ($400 against a typical $359), it is bigger than 35% of them (1,287 ft² against a typical 1,479 ft²), its lot is bigger than 28% of them (0.15 ac against a typical 0.16 ac) and it is newer than 54% of them (1953 against a typical 1953). Measured against all of Montgomery County, it is worth more than 33% 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 521 Calvin Ln, Rockville, MD?

The 2025 property tax bill for 521 Calvin Ln, Rockville, MD was $5,817. The county assessed it at $428,133.

Closest homes

More homes in Rockville 20851

Assigned schools

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