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Single Family ResidenceResidential
$588,969$347 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jun 23, 2026
Last sold for $550,000 on Apr 13, 2023

400 CARL ST

ROCKVILLE, MD 20851
2
Baths
1,696 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.
0.21 ac
Lot SizeThe size of the land the home sits on, from county records.
1955
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$589K
$554K low$624K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$550,000 · Apr 13, 2023
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.$588,969
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$471,175

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,138 (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.$475,433 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$423,167
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$527,700

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.26 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.21
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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 · 390 ft²

Transaction History(2)

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 · 0.6 mi
H
Rockville High SchoolB-
High · Grades 9–12 · 0.6 mi
M
Earle B. Wood Middle SchoolB-
Middle · Grades 6–8 · 1.4 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.Absentee owner
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

400 Carl St 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 74% of homes in Rockville 20851
  • Costs more per square foot than 67% of homes in Montgomery County
  • Bigger than 69% of homes in Rockville 20851
  • Has a bigger lot than 86% of homes in Rockville 20851
  • Older than 82% 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$757K

This home is worth more than 74% 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$588,969
CheaperTypical $533,727Pricier

Pricier than 74% of homes nearby

Price per ft²$347
CheaperTypical $358Pricier

Pricier than 44% of homes nearby

Living area1,696 ft²
SmallerTypical 1,480 ft²Bigger

Bigger than 69% of homes nearby

Lot size0.21 ac
SmallerTypical 0.16 acBigger

Bigger than 86% of homes nearby

Year built1955
OlderTypical 1953Newer

Newer than 73% of homes nearby

How 400 Carl St ranks against every home in each area.
MeasureThis homeRockvilleRockville 20851Montgomery County
Estimated valuepricier than$588,96939% of homes74% of homes44% of homes
Price per ft²pricier than$34749% of homes44% of homes67% of homes
Living areabigger than1,696 ft²42% of homes69% of homes38% of homes
Lot sizebigger than0.21 ac72% of homes86% of homes63% of homes
Year builtnewer than195523% of homes73% of homes18% of homes

About 400 Carl St

How much is 400 Carl St, Rockville, MD worth?

The TopHap Estimate for 400 Carl St, Rockville, MD is $588,969 as of Jun 23, 2026. The likely range is $553,630 to $624,307. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 400 Carl St, Rockville, MD last sell?

400 Carl St, Rockville, MD last sold on Apr 13, 2023 for $550,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 400 Carl St, Rockville, MD?

400 Carl St, Rockville, MD has 2 bathrooms, 1,696 square feet of living space and a 0.21-acre lot.

When was 400 Carl St, Rockville, MD built?

400 Carl St, Rockville, MD was built in 1955, making it 71 years old. The building has 1 story.

What schools serve 400 Carl St, Rockville, MD?

400 Carl St, 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 400 Carl St, Rockville, MD compare to other homes in Rockville 20851?

Among the 3,658 homes in Rockville 20851, it is worth more than 74% of them ($588,969 against a typical $533,727), its price per square foot is higher than 44% of them ($347 against a typical $358), it is bigger than 69% of them (1,696 ft² against a typical 1,480 ft²), its lot is bigger than 86% of them (0.21 ac against a typical 0.16 ac) and it is newer than 73% of them (1955 against a typical 1953). Measured against all of Montgomery County, it is worth more than 44% 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 400 Carl St, Rockville, MD?

The 2025 property tax bill for 400 Carl St, Rockville, MD was $7,138. The county assessed it at $475,433.

Closest homes

More homes in Rockville 20851

Assigned schools

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