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Single Family ResidenceResidential
$527,183$445 / 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 88How 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 $514,900 on May 28, 2025

511 CRABB AVE

ROCKVILLE, MD 20850
2
Baths
1,184 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1952
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$527K
$462K low$592K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$514,900 · May 28, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,717 (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.$448,000 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$247,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$201,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$420,667
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$448,000

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.12 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Conventional
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.12
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
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 · 128 ft²

Transaction History(5)

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
Maryvale Elementary SchoolB-
Elementary · Grades PK–5 · 0.3 mi
H
Rockville High SchoolB-
High · Grades 9–12 · 1.2 mi
M
Earle B. Wood Middle SchoolB-
Middle · Grades 6–8 · 1.8 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20850These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.40

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.7.8%
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.51,693
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,703 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,425
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$154,183
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%

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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

511 Crabb 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 76% of homes in Rockville 20850
  • Costs more per square foot than 88% of homes in Rockville 20850
  • Smaller than 86% of homes in Rockville
  • Older than 93% of homes in Rockville 20850

What homes are worth in Rockville 20850

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

This home
$177K$1.6M

This home is worth more than 24% of homes in Rockville 20850.

How it measures up in Rockville 20850

The dot is this home. The mark in the middle is the typical home in Rockville 20850.

Estimated value$527,183
CheaperTypical $766,915Pricier

Pricier than 24% of homes nearby

Price per ft²$445
CheaperTypical $340Pricier

Pricier than 88% of homes nearby

Living area1,184 ft²
SmallerTypical 2,028 ft²Bigger

Bigger than 15% of homes nearby

Lot size0.11 ac
SmallerTypical 4,138 ft²Bigger

Bigger than 51% of homes nearby

Year built1952
OlderTypical 1991Newer

Newer than 7% of homes nearby

How 511 Crabb Ave ranks against every home in each area.
MeasureThis homeRockvilleRockville 20850Montgomery County
Estimated valuepricier than$527,18328% of homes24% of homes34% of homes
Price per ft²pricier than$44587% of homes88% of homes88% of homes
Living areabigger than1,184 ft²14% of homes15% of homes15% of homes
Lot sizebigger than0.11 ac38% of homes51% of homes38% of homes
Year builtnewer than195212% of homes7% of homes14% of homes

About 511 Crabb Ave

How much is 511 Crabb Ave, Rockville, MD worth?

The TopHap Estimate for 511 Crabb Ave, Rockville, MD is $527,183 as of Jul 14, 2026. The likely range is $462,380 to $591,986. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 511 Crabb Ave, Rockville, MD last sell?

511 Crabb Ave, Rockville, MD last sold on May 28, 2025 for $514,900, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 511 Crabb Ave, Rockville, MD?

511 Crabb Ave, Rockville, MD has 2 bathrooms, 1,184 square feet of living space and a 0.12-acre lot.

When was 511 Crabb Ave, Rockville, MD built?

511 Crabb Ave, Rockville, MD was built in 1952, making it 74 years old. It is a conventional home. The building has 1 story.

What schools serve 511 Crabb Ave, Rockville, MD?

511 Crabb Ave, Rockville, MD is assigned to Maryvale Elementary School (elementary), rated B-; 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 511 Crabb Ave, Rockville, MD compare to other homes in Rockville 20850?

Among the 14,094 homes in Rockville 20850, it is worth more than 24% of them ($527,183 against a typical $766,915), its price per square foot is higher than 88% of them ($445 against a typical $340), it is bigger than 15% of them (1,184 ft² against a typical 2,028 ft²), its lot is bigger than 51% of them (0.11 ac against a typical 4,138 ft²) and it is newer than 7% of them (1952 against a typical 1991). Measured against all of Montgomery County, it is worth more than 34% 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 511 Crabb Ave, Rockville, MD?

The 2025 property tax bill for 511 Crabb Ave, Rockville, MD was $5,717. The county assessed it at $448,000.

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