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Single Family ResidenceResidential
$554,582$315 / 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 Oct 21, 2026
Last sold for $550,000 on Jan 8, 2026

309 GRUENTHER AVE

ROCKVILLE, MD 20851
2
Baths
1,761 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1981
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.

Valuation

$555K
$490K low$619K 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 · Jan 8, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,750 (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.$468,200 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$237,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$230,900
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$446,233
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$468,200

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.Townhouse
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.17
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 · 216 ft²

Transaction History(6)

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 · 0.5 mi
H
Rockville High SchoolB-
High · Grades 9–12 · 0.7 mi
M
Earle B. Wood Middle SchoolB-
Middle · Grades 6–8 · 1.2 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%

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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

309 Gruenther 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 68% of homes in Rockville
  • Costs less per square foot than 73% of homes in Rockville 20851
  • Bigger than 73% of homes in Rockville 20851
  • Newer than 95% of homes in Rockville 20851

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
$396K$757K

This home is worth more than 59% 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$554,582
CheaperTypical $537,526Pricier

Pricier than 59% of homes nearby

Price per ft²$315
CheaperTypical $364Pricier

Pricier than 27% of homes nearby

Living area1,761 ft²
SmallerTypical 1,482 ft²Bigger

Bigger than 73% of homes nearby

Lot size0.17 ac
SmallerTypical 0.16 acBigger

Bigger than 55% of homes nearby

Year built1981
OlderTypical 1953Newer

Newer than 95% of homes nearby

How 309 Gruenther Ave ranks against every home in each area.
MeasureThis homeRockvilleRockville 20851Montgomery County
Estimated valuepricier than$554,58232% of homes59% of homes40% of homes
Price per ft²pricier than$31528% of homes27% of homes56% of homes
Living areabigger than1,761 ft²45% of homes73% of homes40% of homes
Lot sizebigger than0.17 ac56% of homes55% of homes52% of homes
Year builtnewer than198161% of homes95% of homes54% of homes

About 309 Gruenther Ave

How much is 309 Gruenther Ave, Rockville, MD worth?

The TopHap Estimate for 309 Gruenther Ave, Rockville, MD is $554,582 as of Oct 21, 2026. The likely range is $489,930 to $619,234. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 309 Gruenther Ave, Rockville, MD last sell?

309 Gruenther Ave, Rockville, MD last sold on Jan 8, 2026 for $550,000, according to the county's recorded deed. TopHap holds 5 recorded sales for this parcel.

How big is 309 Gruenther Ave, Rockville, MD?

309 Gruenther Ave, Rockville, MD has 2 bathrooms, 1,761 square feet of living space and a 0.17-acre lot.

When was 309 Gruenther Ave, Rockville, MD built?

309 Gruenther Ave, Rockville, MD was built in 1981, making it 45 years old. It is a townhouse home. The building has 1 story.

What schools serve 309 Gruenther Ave, Rockville, MD?

309 Gruenther Ave, 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 309 Gruenther Ave, Rockville, MD compare to other homes in Rockville 20851?

Among the 3,659 homes in Rockville 20851, it is worth more than 59% of them ($554,582 against a typical $537,526), its price per square foot is higher than 27% of them ($315 against a typical $364), it is bigger than 73% of them (1,761 ft² against a typical 1,482 ft²), its lot is bigger than 55% of them (0.17 ac against a typical 0.16 ac) and it is newer than 95% of them (1981 against a typical 1953). Measured against all of Montgomery County, it is worth more than 40% 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 309 Gruenther Ave, Rockville, MD?

The 2025 property tax bill for 309 Gruenther Ave, Rockville, MD was $6,750. The county assessed it at $468,200.

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