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Single Family ResidenceResidential
$206,281$192 / 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 86How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026
Last sold for $179,550 on Sep 15, 2026

9921 AFFTON PL

SAINT LOUIS, MO 63123
1
Beds
1.5
Baths
1,073 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.
0.22 ac
Lot SizeThe size of the land the home sits on, from county records.
1941
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$206K
$178K low$235K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$179,550 · Sep 15, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,166 (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.$42,700 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$15,280
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$27,420
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$34,450
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$224,700

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.40
10
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
17
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.
77
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.7 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.Ranch
CountyST. LOUIS
Lot (acres)The size of the land the home sits on, from county records.0.22
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.Raised (Unspecified)
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.No
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Patio · 75 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
Mesnier Primary School
Elementary · Grades KG–2 · 0.7 mi
H
Affton High SchoolB-
High · Grades 9–12 · 1.0 mi
M
Rogers Middle SchoolB
Middle · Grades 6–8 · 2.0 mi

District: Affton 101 School District

Neighborhood · ZIP 63123These 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.101
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.92
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.148

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.2%
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.49,901
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,037 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$74,459
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$90,085
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.41 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

9921 Affton Pl 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 less than 80% of homes in Affton
  • Costs less per square foot than 67% of homes in Affton
  • Smaller than 73% of homes in St. Louis County
  • Has a bigger lot than 78% of homes in Affton
  • Older than 86% of homes in Saint Louis 63123

What homes are worth in Saint Louis 63123

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

This home
$125K$624K

This home is worth more than 23% of homes in Saint Louis 63123.

How it measures up in Saint Louis 63123

The dot is this home. The mark in the middle is the typical home in Saint Louis 63123.

Estimated value$206,281
CheaperTypical $242,347Pricier

Pricier than 23% of homes nearby

Price per ft²$192
CheaperTypical $204Pricier

Pricier than 37% of homes nearby

Living area1,073 ft²
SmallerTypical 1,202 ft²Bigger

Bigger than 36% of homes nearby

Lot size0.22 ac
SmallerTypical 0.17 acBigger

Bigger than 77% of homes nearby

Year built1941
OlderTypical 1956Newer

Newer than 14% of homes nearby

How 9921 Affton Pl ranks against every home in each area.
MeasureThis homeAfftonSaint Louis 63123St. Louis County
Estimated valuepricier than$206,28120% of homes23% of homes36% of homes
Price per ft²pricier than$19233% of homes37% of homes55% of homes
Living areabigger than1,073 ft²37% of homes36% of homes27% of homes
Lot sizebigger than0.22 ac78% of homes77% of homes55% of homes
Year builtnewer than194122% of homes14% of homes14% of homes

About 9921 Affton Pl

How much is 9921 Affton Pl, Saint Louis, MO worth?

The TopHap Estimate for 9921 Affton Pl, Saint Louis, MO is $206,281 as of Oct 21, 2026. The likely range is $177,818 to $234,744. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 9921 Affton Pl, Saint Louis, MO last sell?

9921 Affton Pl, Saint Louis, MO last sold on Sep 15, 2026 for $179,550, according to the county's recorded deed.

How big is 9921 Affton Pl, Saint Louis, MO?

9921 Affton Pl, Saint Louis, MO has 1 bedrooms, 1.5 bathrooms, 1,073 square feet of living space and a 0.22-acre lot.

When was 9921 Affton Pl, Saint Louis, MO built?

9921 Affton Pl, Saint Louis, MO was built in 1941, making it 85 years old. It is a ranch home. The building has 1 story.

What schools serve 9921 Affton Pl, Saint Louis, MO?

9921 Affton Pl, Saint Louis, MO is assigned to Mesnier Primary School (elementary); Affton High School (high), rated B-; Rogers Middle School (middle), rated B. All sit in Affton 101 School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9921 Affton Pl, Saint Louis, MO compare to other homes in Saint Louis 63123?

Among the 19,670 homes in Saint Louis 63123, it is worth more than 23% of them ($206,281 against a typical $242,347), its price per square foot is higher than 37% of them ($192 against a typical $204), it is bigger than 36% of them (1,073 ft² against a typical 1,202 ft²), its lot is bigger than 77% of them (0.22 ac against a typical 0.17 ac) and it is newer than 14% of them (1941 against a typical 1956). Measured against all of St. Louis County, it is worth more than 36% 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 9921 Affton Pl, Saint Louis, MO?

The 2025 property tax bill for 9921 Affton Pl, Saint Louis, MO was $3,166. The county assessed it at $42,700.

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