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Single Family ResidenceResidential
$223,327$256 / 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 95How 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

321 BALLWIN AVE

BALLWIN, MO 63021
2
Beds
2
Baths
872 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.
0.19 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.
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

$223K
$211K low$236K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,308 (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.$37,050 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$24,190
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$12,860
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$42,730
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$195,000

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.42
25
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
15
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
87
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
75
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.15 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.0.2 percent flood zone

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.Bungalow
CountyST. LOUIS
Lot (acres)The size of the land the home sits on, from county records.0.18
FoundationWhat the home is built on, such as a concrete slab, a crawl space, or a basement.No Foundation
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.Carport (Unspecified)
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.Shed · 384 ft²Patio · 168 ft²Porch · 271 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.

M
Southwest Middle SchoolA
Middle · Grades 6–8 · 1.0 mi
H
South High SchoolA
High · Grades 9–12 · 1.2 mi
E
Sorrento Springs Elementary SchoolC+
Elementary · Grades KG–5 · 1.3 mi

District: Parkway School District

Neighborhood · ZIP 63021These 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.41
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 100.129

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.97%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.39%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.55,113
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,498 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$113,595
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$131,969
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

321 Ballwin Ave 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 91% of homes in Ballwin 63021
  • Costs more per square foot than 85% of homes in Ballwin 63021
  • Smaller than 98% of homes in Ballwin 63021
  • Has a bigger lot than 81% of homes in Winchester
  • Older than 93% of homes in Ballwin 63021

What homes are worth in Ballwin 63021

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

This home
$178K$833K

This home is worth more than 9% of homes in Ballwin 63021.

How it measures up in Ballwin 63021

The dot is this home. The mark in the middle is the typical home in Ballwin 63021.

Estimated value$223,327
CheaperTypical $365,492Pricier

Pricier than 9% of homes nearby

Price per ft²$256
CheaperTypical $214Pricier

Pricier than 85% of homes nearby

Living area872 ft²
SmallerTypical 1,684 ft²Bigger

Bigger than 2% of homes nearby

Lot size0.19 ac
SmallerTypical 0.21 acBigger

Bigger than 36% of homes nearby

Year built1959
OlderTypical 1983Newer

Newer than 7% of homes nearby

How 321 Ballwin Ave ranks against every home in each area.
MeasureThis homeWinchesterBallwin 63021St. Louis County
Estimated valuepricier than$223,32726% of homes9% of homes40% of homes
Price per ft²pricier than$25670% of homes85% of homes84% of homes
Living areabigger than872 ft²22% of homes2% of homes9% of homes
Lot sizebigger than0.19 ac81% of homes36% of homes43% of homes
Year builtnewer than195946% of homes7% of homes41% of homes

About 321 Ballwin Ave

How much is 321 Ballwin Ave, Ballwin, MO worth?

The TopHap Estimate for 321 Ballwin Ave, Ballwin, MO is $223,327 as of Sep 24, 2026. The likely range is $211,127 to $235,527. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 321 Ballwin Ave, Ballwin, MO last sell?

321 Ballwin Ave, Ballwin, MO last sold on Nov 28, 2018, according to the county's recorded deed.

How big is 321 Ballwin Ave, Ballwin, MO?

321 Ballwin Ave, Ballwin, MO has 2 bedrooms, 2 bathrooms, 872 square feet of living space and a 0.18-acre lot.

When was 321 Ballwin Ave, Ballwin, MO built?

321 Ballwin Ave, Ballwin, MO was built in 1959, making it 67 years old. It is a bungalow home. The building has 1 story.

What schools serve 321 Ballwin Ave, Ballwin, MO?

321 Ballwin Ave, Ballwin, MO is assigned to Southwest Middle School (middle), rated A; South High School (high), rated A; Sorrento Springs Elementary School (elementary), rated C+. All sit in Parkway School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 321 Ballwin Ave, Ballwin, MO compare to other homes in Ballwin 63021?

Among the 19,805 homes in Ballwin 63021, it is worth more than 9% of them ($223,327 against a typical $365,492), its price per square foot is higher than 85% of them ($256 against a typical $214), it is bigger than 2% of them (872 ft² against a typical 1,684 ft²), its lot is bigger than 36% of them (0.19 ac against a typical 0.21 ac) and it is newer than 7% of them (1959 against a typical 1983). Measured against all of St. Louis County, it is worth more than 40% 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 321 Ballwin Ave, Ballwin, MO?

The 2025 property tax bill for 321 Ballwin Ave, Ballwin, MO was $2,308. The county assessed it at $37,050.

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