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Single Family ResidenceResidential
$787,030$262 / 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 Sep 24, 2026
Last sold for $510,000 on Jun 2, 2015

18601 THORNBERRY LN

OLNEY, MD 20832
2.5
Baths
3,009 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.
0.27 ac
Lot SizeThe size of the land the home sits on, from county records.
1979
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

$787K
$754K low$820K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$510,000 · Jun 2, 2015

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,400 (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.$690,633 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$656,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$758,900

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.0.27
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.Patio · 276 ft²Porch · 92 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.

M
Rosa M. Parks Middle SchoolA-
Middle · Grades 6–8 · 0.7 mi
E
Belmont Elementary SchoolA+
Elementary · Grades KG–5 · 1.5 mi
H
Sherwod High SchoolB
High · Grades 9–12 · 3.7 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20832These 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.48
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 100.35

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.33%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
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.24,644
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,442 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$162,184
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$179,554
Average tempThe average temperature here across a full year.54°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

18601 Thornberry 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 more than 72% of homes in Olney 20832
  • Costs less per square foot than 71% of homes in Olney 20832
  • Bigger than 77% of homes in Montgomery County
  • Has a bigger lot than 75% of homes in Montgomery County
  • Older than 72% of homes in Olney 20832

What homes are worth in Olney 20832

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

This home
$249K$1.3M

This home is worth more than 72% of homes in Olney 20832.

How it measures up in Olney 20832

The dot is this home. The mark in the middle is the typical home in Olney 20832.

Estimated value$787,030
CheaperTypical $675,817Pricier

Pricier than 72% of homes nearby

Price per ft²$262
CheaperTypical $293Pricier

Pricier than 29% of homes nearby

Living area3,009 ft²
SmallerTypical 2,260 ft²Bigger

Bigger than 76% of homes nearby

Lot size0.27 ac
SmallerTypical 0.23 acBigger

Bigger than 62% of homes nearby

Year built1979
OlderTypical 1986Newer

Newer than 28% of homes nearby

How 18601 Thornberry Ln ranks against every home in each area.
MeasureThis homeOlney 20832Montgomery County
Estimated valuepricier than$787,03072% of homes66% of homes
Price per ft²pricier than$26229% of homes29% of homes
Living areabigger than3,009 ft²76% of homes77% of homes
Lot sizebigger than0.27 ac62% of homes75% of homes
Year builtnewer than197928% of homes51% of homes

About 18601 Thornberry Ln

How much is 18601 Thornberry Ln, Olney, MD worth?

The TopHap Estimate for 18601 Thornberry Ln, Olney, MD is $787,030 as of Sep 24, 2026. The likely range is $753,736 to $820,324. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18601 Thornberry Ln, Olney, MD last sell?

18601 Thornberry Ln, Olney, MD last sold on Jun 2, 2015 for $510,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18601 Thornberry Ln, Olney, MD?

18601 Thornberry Ln, Olney, MD has 2.5 bathrooms, 3,009 square feet of living space and a 0.27-acre lot.

When was 18601 Thornberry Ln, Olney, MD built?

18601 Thornberry Ln, Olney, MD was built in 1979, making it 47 years old. It is a bi-level home. The building has 2 stories.

What schools serve 18601 Thornberry Ln, Olney, MD?

18601 Thornberry Ln, Olney, MD is assigned to Rosa M. Parks Middle School (middle), rated A-; Belmont Elementary School (elementary), rated A+; Sherwod High School (high), rated B. All sit in Montgomery County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 18601 Thornberry Ln, Olney, MD compare to other homes in Olney 20832?

Among the 8,619 homes in Olney 20832, it is worth more than 72% of them ($787,030 against a typical $675,817), its price per square foot is higher than 29% of them ($262 against a typical $293), it is bigger than 76% of them (3,009 ft² against a typical 2,260 ft²), its lot is bigger than 62% of them (0.27 ac against a typical 0.23 ac) and it is newer than 28% of them (1979 against a typical 1986). Measured against all of Montgomery County, it is worth more than 66% 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 18601 Thornberry Ln, Olney, MD?

The 2025 property tax bill for 18601 Thornberry Ln, Olney, MD was $7,400. The county assessed it at $690,633.

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