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Single Family ResidenceResidential
$570,001$471 / 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 90How 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 $672,182 on Aug 21, 2025

421 KEYSTONE DR

FENTON, MO 63026
2.5
Baths
1,209 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.
0.52 ac
Lot SizeThe size of the land the home sits on, from county records.
1999
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.

Valuation

$570K
$515K low$625K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$672,182 · Aug 21, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,902 (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.$55,100 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$9,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$45,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$48,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$290,200

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.46
19
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
39
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
88
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
80
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
8
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.11 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
CountyJEFFERSON
Lot (acres)The size of the land the home sits on, from county records.0.52
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
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.DeckPatio · 297 ft²Porch · 68 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
George Guffy Elementary SchoolA
Elementary · Grades KG–5 · 1.2 mi
M
Ridgewood Middle SchoolA
Middle · Grades 6–8 · 2.4 mi
H
Fox High SchoolB-
High · Grades 9–12 · 4.1 mi

District: Fox C-6 School District

Neighborhood · ZIP 63026These 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.82
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.84
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.142

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.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.43,818
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,697 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$95,941
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$113,908
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.42 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

421 Keystone Dr 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 97% of homes in Jefferson County
  • Among the highest price per square foot in Fenton 63026
  • Smaller than 66% of homes in Fenton 63026
  • Has a bigger lot than 87% of homes in Fenton 63026
  • Newer than 75% of homes in Fenton 63026

What homes are worth in Fenton 63026

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

This home
$157K$757K

This home is worth more than 91% of homes in Fenton 63026.

How it measures up in Fenton 63026

The dot is this home. The mark in the middle is the typical home in Fenton 63026.

Estimated value$570,001
CheaperTypical $345,464Pricier

Pricier than 91% of homes nearby

Price per ft²$471
CheaperTypical $225Pricier

Pricier than almost all homes nearby

Living area1,209 ft²
SmallerTypical 1,478 ft²Bigger

Bigger than 34% of homes nearby

Lot size0.52 ac
SmallerTypical 0.24 acBigger

Bigger than 87% of homes nearby

Year built1999
OlderTypical 1987Newer

Newer than 75% of homes nearby

How 421 Keystone Dr ranks against every home in each area.
MeasureThis homeFenton 63026Jefferson County
Estimated valuepricier than$570,00191% of homes97% of homes
Price per ft²pricier than$471almost all homesalmost all homes
Living areabigger than1,209 ft²34% of homes39% of homes
Lot sizebigger than0.52 ac87% of homes58% of homes
Year builtnewer than199975% of homes68% of homes

About 421 Keystone Dr

How much is 421 Keystone Dr, Fenton, MO worth?

The TopHap Estimate for 421 Keystone Dr, Fenton, MO is $570,001 as of Sep 24, 2026. The likely range is $515,095 to $624,907. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 421 Keystone Dr, Fenton, MO last sell?

421 Keystone Dr, Fenton, MO last sold on Aug 21, 2025 for $672,182, according to the county's recorded deed.

How big is 421 Keystone Dr, Fenton, MO?

421 Keystone Dr, Fenton, MO has 2.5 bathrooms, 1,209 square feet of living space and a 0.52-acre lot.

When was 421 Keystone Dr, Fenton, MO built?

421 Keystone Dr, Fenton, MO was built in 1999, making it 27 years old. It is a bi-level home. The building has 2 stories.

What schools serve 421 Keystone Dr, Fenton, MO?

421 Keystone Dr, Fenton, MO is assigned to George Guffy Elementary School (elementary), rated A; Ridgewood Middle School (middle), rated A; Fox High School (high), rated B-. All sit in Fox C-6 School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 421 Keystone Dr, Fenton, MO compare to other homes in Fenton 63026?

Among the 14,772 homes in Fenton 63026, it is worth more than 91% of them ($570,001 against a typical $345,464), its price per square foot is higher than almost all of them ($471 against a typical $225), it is bigger than 34% of them (1,209 ft² against a typical 1,478 ft²), its lot is bigger than 87% of them (0.52 ac against a typical 0.24 ac) and it is newer than 75% of them (1999 against a typical 1987). Measured against all of Jefferson County, it is worth more than 97% 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 421 Keystone Dr, Fenton, MO?

The 2025 property tax bill for 421 Keystone Dr, Fenton, MO was $3,902. The county assessed it at $55,100.

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