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Single Family ResidenceResidential
$625,065$283 / 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 Sep 24, 2026
Last sold for $525,000 on Sep 1, 2021

4221 ISBELL ST

SILVER SPRING, MD 20906
3.5
Baths
2,206 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1959
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$625K
$604K low$646K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$525,000 · Sep 1, 2021

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,666 (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.$536,167 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$508,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$592,500

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.0.18
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
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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
Sargent Shriver Elementary SchoolD+
Elementary · Grades PK–5 · 0.3 mi
M
A. Mario Loiederman Middle SchoolD+
Middle · Grades 6–8 · 0.7 mi
H
Wheaton High SchoolB-
High · Grades 9–12 · 0.9 mi

District: Montgomery County Public Schools

Neighborhood · ZIP 20906These 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.94
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.91
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.34

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.22%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
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.73,317
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.6,006 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$95,461
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$122,414
Average tempThe average temperature here across a full year.55°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%

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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

4221 Isbell St 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 78% of homes in Silver Spring 20906
  • Bigger than 77% of homes in Silver Spring 20906
  • Has a bigger lot than 71% of homes in Silver Spring 20906
  • Older than 79% of homes in Silver Spring 20906

What homes are worth in Silver Spring 20906

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

This home
$143K$1M

This home is worth more than 78% of homes in Silver Spring 20906.

How it measures up in Silver Spring 20906

The dot is this home. The mark in the middle is the typical home in Silver Spring 20906.

Estimated value$625,065
CheaperTypical $458,530Pricier

Pricier than 78% of homes nearby

Price per ft²$283
CheaperTypical $264Pricier

Pricier than 63% of homes nearby

Living area2,206 ft²
SmallerTypical 1,520 ft²Bigger

Bigger than 77% of homes nearby

Lot size0.18 ac
SmallerTypical 0.13 acBigger

Bigger than 71% of homes nearby

Year built1959
OlderTypical 1977Newer

Newer than 21% of homes nearby

How 4221 Isbell St ranks against every home in each area.
MeasureThis homeSilver Spring 20906Montgomery County
Estimated valuepricier than$625,06578% of homes49% of homes
Price per ft²pricier than$28363% of homes40% of homes
Living areabigger than2,206 ft²77% of homes57% of homes
Lot sizebigger than0.18 ac71% of homes55% of homes
Year builtnewer than195921% of homes23% of homes

About 4221 Isbell St

How much is 4221 Isbell St, Silver Spring, MD worth?

The TopHap Estimate for 4221 Isbell St, Silver Spring, MD is $625,065 as of Sep 24, 2026. The likely range is $604,492 to $645,638. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4221 Isbell St, Silver Spring, MD last sell?

4221 Isbell St, Silver Spring, MD last sold on Sep 1, 2021 for $525,000, according to the county's recorded deed.

How big is 4221 Isbell St, Silver Spring, MD?

4221 Isbell St, Silver Spring, MD has 3.5 bathrooms, 2,206 square feet of living space and a 0.18-acre lot.

When was 4221 Isbell St, Silver Spring, MD built?

4221 Isbell St, Silver Spring, MD was built in 1959, making it 67 years old. It is a bi-level home. The building has 2 stories.

What schools serve 4221 Isbell St, Silver Spring, MD?

4221 Isbell St, Silver Spring, MD is assigned to Sargent Shriver Elementary School (elementary), rated D+; A. Mario Loiederman Middle School (middle), rated D+; Wheaton 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 4221 Isbell St, Silver Spring, MD compare to other homes in Silver Spring 20906?

Among the 21,639 homes in Silver Spring 20906, it is worth more than 78% of them ($625,065 against a typical $458,530), its price per square foot is higher than 63% of them ($283 against a typical $264), it is bigger than 77% of them (2,206 ft² against a typical 1,520 ft²), its lot is bigger than 71% of them (0.18 ac against a typical 0.13 ac) and it is newer than 21% of them (1959 against a typical 1977). Measured against all of Montgomery County, it is worth more than 49% 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 4221 Isbell St, Silver Spring, MD?

The 2025 property tax bill for 4221 Isbell St, Silver Spring, MD was $6,666. The county assessed it at $536,167.

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