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Single Family ResidenceResidential
$544,088$422 / 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 $372,000 on Aug 5, 2015

9917 BIG ROCK RD

SILVER SPRING, MD 20901
2
Baths
1,288 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.
1946
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$544K
$528K low$560K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$372,000 · Aug 5, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,200 (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.$465,500 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$449,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$497,900

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.Bi-Level
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.Brick
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(4)

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.

M
Eastern Middle SchoolC
Middle · Grades 6–8 · 0.5 mi
H
Montgomery Blair High SchoolB
High · Grades 9–12 · 0.7 mi
E
Montgomery Knolls Elementary School
Elementary · Grades PK–2 · 0.9 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20901These 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.85
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.35

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.25%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.37,269
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.6,931 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$131,433
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$160,311
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.44 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

9917 Big Rock Rd 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 Silver Spring 20901
  • Costs more per square foot than 90% of homes in Silver Spring 20901
  • Smaller than 85% of homes in Silver Spring 20901
  • Older than 93% of homes in Montgomery County

What homes are worth in Silver Spring 20901

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

This home
$221K$929K

This home is worth more than 32% of homes in Silver Spring 20901.

How it measures up in Silver Spring 20901

The dot is this home. The mark in the middle is the typical home in Silver Spring 20901.

Estimated value$544,088
CheaperTypical $597,496Pricier

Pricier than 32% of homes nearby

Price per ft²$422
CheaperTypical $327Pricier

Pricier than 90% of homes nearby

Living area1,288 ft²
SmallerTypical 1,800 ft²Bigger

Bigger than 15% of homes nearby

Lot size0.15 ac
SmallerTypical 0.16 acBigger

Bigger than 44% of homes nearby

Year built1946
OlderTypical 1952Newer

Newer than 27% of homes nearby

How 9917 Big Rock Rd ranks against every home in each area.
MeasureThis homeSilver Spring 20901Montgomery County
Estimated valuepricier than$544,08832% of homes36% of homes
Price per ft²pricier than$42290% of homes85% of homes
Living areabigger than1,288 ft²15% of homes20% of homes
Lot sizebigger than0.15 ac44% of homes46% of homes
Year builtnewer than194627% of homes7% of homes

About 9917 Big Rock Rd

How much is 9917 Big Rock Rd, Silver Spring, MD worth?

The TopHap Estimate for 9917 Big Rock Rd, Silver Spring, MD is $544,088 as of Jul 14, 2026. The likely range is $527,713 to $560,463. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9917 Big Rock Rd, Silver Spring, MD last sell?

9917 Big Rock Rd, Silver Spring, MD last sold on Aug 5, 2015 for $372,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 9917 Big Rock Rd, Silver Spring, MD?

9917 Big Rock Rd, Silver Spring, MD has 2 bathrooms, 1,288 square feet of living space and a 0.15-acre lot.

When was 9917 Big Rock Rd, Silver Spring, MD built?

9917 Big Rock Rd, Silver Spring, MD was built in 1946, making it 80 years old. It is a bi-level home. The building has 2 stories.

What schools serve 9917 Big Rock Rd, Silver Spring, MD?

9917 Big Rock Rd, Silver Spring, MD is assigned to Eastern Middle School (middle), rated C; Montgomery Blair High School (high), rated B; Montgomery Knolls Elementary School (elementary). All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9917 Big Rock Rd, Silver Spring, MD compare to other homes in Silver Spring 20901?

Among the 10,023 homes in Silver Spring 20901, it is worth more than 32% of them ($544,088 against a typical $597,496), its price per square foot is higher than 90% of them ($422 against a typical $327), it is bigger than 15% of them (1,288 ft² against a typical 1,800 ft²), its lot is bigger than 44% of them (0.15 ac against a typical 0.16 ac) and it is newer than 27% of them (1946 against a typical 1952). Measured against all of Montgomery County, it is worth more than 36% 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 9917 Big Rock Rd, Silver Spring, MD?

The 2025 property tax bill for 9917 Big Rock Rd, Silver Spring, MD was $5,200. The county assessed it at $465,500.

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