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Single Family ResidenceResidential
$1,670,254$363 / 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 95How 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 $1,200,000 on Dec 14, 2010

21718 SLIDELL RD

BOYDS, MD 20841
3.5
Baths
4,597 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.
25.45 ac
Lot SizeThe size of the land the home sits on, from county records.
2002
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$1.7M
$1.6M low$1.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,200,000 · Dec 14, 2010

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$15,859 (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.$1,463,700 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,360,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$1,566,900

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.21 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
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
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.Yes
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.StableDeck · 650 ft²Patio · 600 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
William B. Gibbs Jr. Elementary SchoolB-
Elementary · Grades PK–5 · 3.9 mi
H
Seneca Valley High SchoolC
High · Grades 9–12 · 4.4 mi
M
Neelsville Middle SchoolC
Middle · Grades 6–8 · 5.1 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20841These 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.34
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 100.40

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.4%
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.14,427
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.464 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$163,918
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$191,175
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

21718 Slidell 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.

  • Among the most valuable homes in Boyds
  • Costs more per square foot than 96% of homes in Boyds 20841
  • Bigger than 92% of homes in Montgomery County
  • Among the largest lots in Boyds 20841
  • Newer than 88% of homes in Montgomery County

What homes are worth in Boyds 20841

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

This home
$232K$1.2M

This home is worth more than almost all homes in Boyds 20841.

How it measures up in Boyds 20841

The dot is this home. The mark in the middle is the typical home in Boyds 20841.

Estimated value$1,670,254
CheaperTypical $858,622Pricier

Pricier than almost all homes nearby

Price per ft²$363
CheaperTypical $247Pricier

Pricier than 96% of homes nearby

Living area4,597 ft²
SmallerTypical 3,410 ft²Bigger

Bigger than 81% of homes nearby

Lot size25.45 ac
SmallerTypical 0.21 acBigger

Bigger than almost all homes nearby

Year built2002
OlderTypical 2002Newer

Newer than 51% of homes nearby

How 21718 Slidell Rd ranks against every home in each area.
MeasureThis homeBoydsBoyds 20841Montgomery County
Estimated valuepricier than$1,670,254almost all homesalmost all homes94% of homes
Price per ft²pricier than$36387% of homes96% of homes73% of homes
Living areabigger than4,597 ft²91% of homes81% of homes92% of homes
Lot sizebigger than25.45 acalmost all homesalmost all homesalmost all homes
Year builtnewer than200256% of homes51% of homes88% of homes

About 21718 Slidell Rd

How much is 21718 Slidell Rd, Boyds, MD worth?

The TopHap Estimate for 21718 Slidell Rd, Boyds, MD is $1,670,254 as of Sep 24, 2026. The likely range is $1,589,766 to $1,750,742. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21718 Slidell Rd, Boyds, MD last sell?

21718 Slidell Rd, Boyds, MD last sold on Dec 14, 2010 for $1,200,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21718 Slidell Rd, Boyds, MD?

21718 Slidell Rd, Boyds, MD has 3.5 bathrooms and 4,597 square feet of living space.

When was 21718 Slidell Rd, Boyds, MD built?

21718 Slidell Rd, Boyds, MD was built in 2002, making it 24 years old. It is a bi-level home. The building has 2 stories.

What schools serve 21718 Slidell Rd, Boyds, MD?

21718 Slidell Rd, Boyds, MD is assigned to William B. Gibbs Jr. Elementary School (elementary), rated B-; Seneca Valley High School (high), rated C; Neelsville 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 21718 Slidell Rd, Boyds, MD compare to other homes in Boyds 20841?

Among the 3,098 homes in Boyds 20841, it is worth more than almost all of them ($1,670,254 against a typical $858,622), its price per square foot is higher than 96% of them ($363 against a typical $247), it is bigger than 81% of them (4,597 ft² against a typical 3,410 ft²), its lot is bigger than almost all of them (25.45 ac against a typical 0.21 ac) and it is newer than 51% of them (2002 against a typical 2002). Measured against all of Montgomery County, it is worth more than 94% 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 21718 Slidell Rd, Boyds, MD?

The 2025 property tax bill for 21718 Slidell Rd, Boyds, MD was $15,859. The county assessed it at $1,463,700.

More homes on Slidell Rd

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Assigned schools

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