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Single Family ResidenceResidential
$848,095$533 / 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

4021 THORNTON ST

ANNANDALE, VA 22003
4
Beds
3
Baths
1,590 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.
0.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1960
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$848K
$813K low$883K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,352 (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.$722,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$289,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$433,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$685,830
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$722,500

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.Split Entry
CountyFairfax
Lot (acres)The size of the land the home sits on, from county records.0.20
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.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
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.BalconyDeck · 440 ft²Shed · 288 ft²Patio · 440 ft²

Transaction History(4)

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
Mason Crest Elementary SchoolC-
Elementary · Grades PK–5 · 0.5 mi
M
Poe Middle SchoolD
Middle · Grades 6–8 · 1.1 mi
H
Falls Church High SchoolC
High · Grades 9–12 · 1.9 mi

District: Fairfax County Public Schools

Neighborhood · ZIP 22003These 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.91
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.86
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.37

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.7%
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.59,464
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,742 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,228
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$150,466
Average tempThe average temperature here across a full year.56°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.63%

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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

4021 Thornton 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 66% of homes in Annandale 22003
  • Costs more per square foot than 80% of homes in Fairfax County
  • Has a smaller lot than 77% of homes in Annandale 22003
  • Older than 87% of homes in Fairfax County

What homes are worth in Annandale 22003

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

This home
$219K$1.4M

This home is worth more than 66% of homes in Annandale 22003.

How it measures up in Annandale 22003

The dot is this home. The mark in the middle is the typical home in Annandale 22003.

Estimated value$848,095
CheaperTypical $736,873Pricier

Pricier than 66% of homes nearby

Price per ft²$533
CheaperTypical $430Pricier

Pricier than 76% of homes nearby

Living area1,590 ft²
SmallerTypical 1,475 ft²Bigger

Bigger than 61% of homes nearby

Lot size0.2 ac
SmallerTypical 0.27 acBigger

Bigger than 23% of homes nearby

Year built1960
OlderTypical 1966Newer

Newer than 23% of homes nearby

How 4021 Thornton St ranks against every home in each area.
MeasureThis homeAnnandale 22003Fairfax County
Estimated valuepricier than$848,09566% of homes58% of homes
Price per ft²pricier than$53376% of homes80% of homes
Living areabigger than1,590 ft²61% of homes48% of homes
Lot sizebigger than0.2 ac23% of homes40% of homes
Year builtnewer than196023% of homes13% of homes

About 4021 Thornton St

How much is 4021 Thornton St, Annandale, VA worth?

The TopHap Estimate for 4021 Thornton St, Annandale, VA is $848,095 as of Sep 24, 2026. The likely range is $813,426 to $882,763. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 4021 Thornton St, Annandale, VA last sell?

4021 Thornton St, Annandale, VA last sold on Apr 9, 2012, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 4021 Thornton St, Annandale, VA?

4021 Thornton St, Annandale, VA has 4 bedrooms, 3 bathrooms, 1,590 square feet of living space and a 0.20-acre lot.

When was 4021 Thornton St, Annandale, VA built?

4021 Thornton St, Annandale, VA was built in 1960, making it 66 years old. It is a split entry home. The building has 1 story.

What schools serve 4021 Thornton St, Annandale, VA?

4021 Thornton St, Annandale, VA is assigned to Mason Crest Elementary School (elementary), rated C-; Poe Middle School (middle), rated D; Falls Church High School (high), rated C. All sit in Fairfax County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 4021 Thornton St, Annandale, VA compare to other homes in Annandale 22003?

Among the 16,475 homes in Annandale 22003, it is worth more than 66% of them ($848,095 against a typical $736,873), its price per square foot is higher than 76% of them ($533 against a typical $430), it is bigger than 61% of them (1,590 ft² against a typical 1,475 ft²), its lot is bigger than 23% of them (0.2 ac against a typical 0.27 ac) and it is newer than 23% of them (1960 against a typical 1966). Measured against all of Fairfax County, it is worth more than 58% 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 4021 Thornton St, Annandale, VA?

The 2025 property tax bill for 4021 Thornton St, Annandale, VA was $8,352. The county assessed it at $722,500.

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