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TownhouseResidential
$644,134$390 / 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 Aug 30, 2026
Last sold for $438,000 on Sep 30, 2019

6423 KNAPSACK LN

CENTREVILLE, VA 20121
3
Beds
3 / 2
Baths
1,652 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.
1,994 ft²
Lot SizeThe size of the land the home sits on, from county records.
1992
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$644K
$624K low$665K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$438,000 · Sep 30, 2019

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,424 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$569,120 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$170,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$399,120
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$554,490
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$569,120

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.Bi-Level
CountyFAIRFAX
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
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
PoolWhether the property has a pool, and what kind, such as in-ground.No
ViewThe type of view from the property, or another feature of the site that affects value.Buildable
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck · 216 ft²Patio · 216 ft²Porch · 24 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
Centre Ridge Elementary SchoolC-
Elementary · Grades PK–6 · 0.2 mi
H
Centreville High SchoolC+
High · Grades 9–12 · 1.8 mi
M
Liberty Middle SchoolB+
Middle · Grades 7–8 · 2.1 mi

District: Fairfax County Public Schools

Neighborhood · ZIP 20121These 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.70
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.82
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.38

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.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.29,165
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,182 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$127,130
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$143,940
Average tempThe average temperature here across a full year.56°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.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

6423 Knapsack 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 71% of homes in Centreville 20121
  • Costs less per square foot than 67% of homes in Fairfax County
  • Bigger than 73% of homes in Centreville 20121
  • Has a smaller lot than 80% of homes in Fairfax County
  • Newer than 75% of homes in Fairfax County

What homes are worth in Centreville 20121

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

This home
$284K$1M

This home is worth more than 71% of homes in Centreville 20121.

How it measures up in Centreville 20121

The dot is this home. The mark in the middle is the typical home in Centreville 20121.

Estimated value$644,134
CheaperTypical $575,095Pricier

Pricier than 71% of homes nearby

Price per ft²$390
CheaperTypical $394Pricier

Pricier than 47% of homes nearby

Living area1,652 ft²
SmallerTypical 1,408 ft²Bigger

Bigger than 73% of homes nearby

Lot size1,994 ft²
SmallerTypical 2,004 ft²Bigger

Bigger than 49% of homes nearby

Year built1992
OlderTypical 1991Newer

Newer than 59% of homes nearby

How 6423 Knapsack Ln ranks against every home in each area.
MeasureThis homeCentreville 20121Fairfax County
Estimated valuepricier than$644,13471% of homes34% of homes
Price per ft²pricier than$39047% of homes33% of homes
Living areabigger than1,652 ft²73% of homes51% of homes
Lot sizebigger than1,994 ft²49% of homes20% of homes
Year builtnewer than199259% of homes75% of homes

About 6423 Knapsack Ln

How much is 6423 Knapsack Ln, Centreville, VA worth?

The TopHap Estimate for 6423 Knapsack Ln, Centreville, VA is $644,134 as of Aug 30, 2026. The likely range is $623,750 to $664,518. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 6423 Knapsack Ln, Centreville, VA last sell?

6423 Knapsack Ln, Centreville, VA last sold on Sep 30, 2019 for $438,000, according to the county's recorded deed.

How big is 6423 Knapsack Ln, Centreville, VA?

6423 Knapsack Ln, Centreville, VA has 3 bedrooms, 3 bathrooms, 1,652 square feet of living space and a 0.05-acre lot.

When was 6423 Knapsack Ln, Centreville, VA built?

6423 Knapsack Ln, Centreville, VA was built in 1992, making it 34 years old. It is a bi-level home. The building has 2 stories.

What schools serve 6423 Knapsack Ln, Centreville, VA?

6423 Knapsack Ln, Centreville, VA is assigned to Centre Ridge Elementary School (elementary), rated C-; Centreville High School (high), rated C+; Liberty Middle School (middle), rated B+. All sit in Fairfax County Public Schools. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 6423 Knapsack Ln, Centreville, VA compare to other homes in Centreville 20121?

Among the 8,274 homes in Centreville 20121, it is worth more than 71% of them ($644,134 against a typical $575,095), its price per square foot is higher than 47% of them ($390 against a typical $394), it is bigger than 73% of them (1,652 ft² against a typical 1,408 ft²), its lot is bigger than 49% of them (1,994 ft² against a typical 2,004 ft²) and it is newer than 59% of them (1992 against a typical 1991). Measured against all of Fairfax County, it is worth more than 34% 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 6423 Knapsack Ln, Centreville, VA?

The 2024 property tax bill for 6423 Knapsack Ln, Centreville, VA was $6,424. The county assessed it at $569,120.

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