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TownhouseResidential
$429,048$292 / 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 Jul 14, 2026
Last sold for $435,000 on Mar 29, 2024

18509 SPLIT ROCK LN

GERMANTOWN, MD 20874
2.5
Baths
1,470 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.
2,149 ft²
Lot SizeThe size of the land the home sits on, from county records.
1978
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$429K
$402K low$456K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$435,000 · Mar 29, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,350 (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.$333,300 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$120,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$213,300
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$313,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$333,300

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Townhouse
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.0.05
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
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 · 200 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
Clopper Mill Elementary SchoolC-
Elementary · Grades PK–5 · 0.4 mi
H
Northwest High SchoolB+
High · Grades 9–12 · 0.8 mi
M
Roberto W. Clemente Middle SchoolC+
Middle · Grades 6–8 · 1.2 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20874These 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.88
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.78
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.36

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.26%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.8%
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.63,804
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,847 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$111,042
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$139,548
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%

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

18509 Split Rock Ln 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 79% of homes in Montgomery County
  • Costs more per square foot than 71% of homes in Germantown 20874
  • Smaller than 72% of homes in Montgomery County
  • Has a smaller lot than 74% of homes in Montgomery County
  • Older than 87% of homes in Germantown 20874

What homes are worth in Germantown 20874

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

This home
$226K$1.3M

This home is worth more than 48% of homes in Germantown 20874.

How it measures up in Germantown 20874

The dot is this home. The mark in the middle is the typical home in Germantown 20874.

Estimated value$429,048
CheaperTypical $436,970Pricier

Pricier than 48% of homes nearby

Price per ft²$292
CheaperTypical $265Pricier

Pricier than 71% of homes nearby

Living area1,470 ft²
SmallerTypical 1,582 ft²Bigger

Bigger than 45% of homes nearby

Lot size2,149 ft²
SmallerTypical 2,004 ft²Bigger

Bigger than 58% of homes nearby

Year built1978
OlderTypical 1987Newer

Newer than 13% of homes nearby

How 18509 Split Rock Ln ranks against every home in each area.
MeasureThis homeGermantown 20874Montgomery County
Estimated valuepricier than$429,04848% of homes21% of homes
Price per ft²pricier than$29271% of homes44% of homes
Living areabigger than1,470 ft²45% of homes28% of homes
Lot sizebigger than2,149 ft²58% of homes26% of homes
Year builtnewer than197813% of homes50% of homes

About 18509 Split Rock Ln

How much is 18509 Split Rock Ln, Germantown, MD worth?

The TopHap Estimate for 18509 Split Rock Ln, Germantown, MD is $429,048 as of Jul 14, 2026. The likely range is $401,668 to $456,428. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18509 Split Rock Ln, Germantown, MD last sell?

18509 Split Rock Ln, Germantown, MD last sold on Mar 29, 2024 for $435,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18509 Split Rock Ln, Germantown, MD?

18509 Split Rock Ln, Germantown, MD has 2.5 bathrooms, 1,470 square feet of living space and a 0.05-acre lot.

When was 18509 Split Rock Ln, Germantown, MD built?

18509 Split Rock Ln, Germantown, MD was built in 1978, making it 48 years old. It is a townhouse home. The building has 2 stories.

What schools serve 18509 Split Rock Ln, Germantown, MD?

18509 Split Rock Ln, Germantown, MD is assigned to Clopper Mill Elementary School (elementary), rated C-; Northwest High School (high), rated B+; Roberto W. Clemente Middle School (middle), rated C+. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18509 Split Rock Ln, Germantown, MD compare to other homes in Germantown 20874?

Among the 18,157 homes in Germantown 20874, it is worth more than 48% of them ($429,048 against a typical $436,970), its price per square foot is higher than 71% of them ($292 against a typical $265), it is bigger than 45% of them (1,470 ft² against a typical 1,582 ft²), its lot is bigger than 58% of them (2,149 ft² against a typical 2,004 ft²) and it is newer than 13% of them (1978 against a typical 1987). Measured against all of Montgomery County, it is worth more than 21% 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 18509 Split Rock Ln, Germantown, MD?

The 2025 property tax bill for 18509 Split Rock Ln, Germantown, MD was $3,350. The county assessed it at $333,300.

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Assigned schools

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