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Single Family ResidenceResidential
$1,391,892$365 / 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 96How 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 $502,600 on Dec 19, 2000

13509 GUM SPRING DR

ROCKVILLE, MD 20850
4.5
Baths
3,816 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.
0.29 ac
Lot SizeThe size of the land the home sits on, from county records.
2000
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.4M
$1.3M low$1.4M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$502,600 · Dec 19, 2000

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,457 (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.$1,098,033 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,008,867
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,187,200

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.15
34
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
11
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
34
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.6 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.Bi-Level
CountyMONTGOMERY
Lot (acres)The size of the land the home sits on, from county records.0.29
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

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
Stone Mill Elementary SchoolA
Elementary · Grades KG–5 · 1.1 mi
H
Thomas S. Wootton High SchoolA+
High · Grades 9–12 · 2.5 mi
M
Cabin John Middle SchoolA
Middle · Grades 6–8 · 4.6 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%

Owner Tools

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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

13509 Gum Spring Dr 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 91% of homes in Rockville 20850
  • Costs more per square foot than 73% of homes in Montgomery County
  • Bigger than 87% of homes in Rockville 20850
  • Has a bigger lot than 85% of homes in Rockville 20850
  • Newer than 85% of homes in Montgomery County

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
$179K$1.7M

This home is worth more than 91% 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$1,391,892
CheaperTypical $768,315Pricier

Pricier than 91% of homes nearby

Price per ft²$365
CheaperTypical $340Pricier

Pricier than 64% of homes nearby

Living area3,816 ft²
SmallerTypical 2,048 ft²Bigger

Bigger than 87% of homes nearby

Lot size0.29 ac
SmallerTypical 4,138 ft²Bigger

Bigger than 85% of homes nearby

Year built2000
OlderTypical 1991Newer

Newer than 69% of homes nearby

How 13509 Gum Spring Dr ranks against every home in each area.
MeasureThis homeRockville 20850Montgomery County
Estimated valuepricier than$1,391,89291% of homes91% of homes
Price per ft²pricier than$36564% of homes73% of homes
Living areabigger than3,816 ft²87% of homes87% of homes
Lot sizebigger than0.29 ac85% of homes77% of homes
Year builtnewer than200069% of homes85% of homes

About 13509 Gum Spring Dr

How much is 13509 Gum Spring Dr, Rockville, MD worth?

The TopHap Estimate for 13509 Gum Spring Dr, Rockville, MD is $1,391,892 as of Jul 14, 2026. The likely range is $1,338,021 to $1,445,763. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 13509 Gum Spring Dr, Rockville, MD last sell?

13509 Gum Spring Dr, Rockville, MD last sold on Dec 19, 2000 for $502,600, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 13509 Gum Spring Dr, Rockville, MD?

13509 Gum Spring Dr, Rockville, MD has 4.5 bathrooms, 3,816 square feet of living space and a 0.29-acre lot.

When was 13509 Gum Spring Dr, Rockville, MD built?

13509 Gum Spring Dr, Rockville, MD was built in 2000, making it 26 years old. It is a bi-level home. The building has 2 stories.

What schools serve 13509 Gum Spring Dr, Rockville, MD?

13509 Gum Spring Dr, Rockville, MD is assigned to Stone Mill Elementary School (elementary), rated A; Thomas S. Wootton High School (high), rated A+; Cabin John Middle School (middle), rated A. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 13509 Gum Spring Dr, Rockville, MD compare to other homes in Rockville 20850?

Among the 14,094 homes in Rockville 20850, it is worth more than 91% of them ($1,391,892 against a typical $768,315), its price per square foot is higher than 64% of them ($365 against a typical $340), it is bigger than 87% of them (3,816 ft² against a typical 2,048 ft²), its lot is bigger than 85% of them (0.29 ac against a typical 4,138 ft²) and it is newer than 69% of them (2000 against a typical 1991). Measured against all of Montgomery County, it is worth more than 91% 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 13509 Gum Spring Dr, Rockville, MD?

The 2025 property tax bill for 13509 Gum Spring Dr, Rockville, MD was $11,457. The county assessed it at $1,098,033.

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