Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$86,772$75 / 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 80How 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

21 S HARTNETT AVE

SAINT LOUIS, MO 63135
4
Beds
2 / 1
Baths
1,163 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.
0.25 ac
Lot SizeThe size of the land the home sits on, from county records.
1937
Year BuiltThe year the home was originally built, according to county records.
1
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$87K
$70K low$104K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,610 (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.$29,200 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$4,160
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$25,040
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$22,190
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$153,700

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.43
46
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.
87
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
64
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
4
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.12 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.Bungalow
CountySt. Louis
Lot (acres)The size of the land the home sits on, from county records.0.25
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.Forced Air
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, Detached

Transaction History(1)

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
Central Primary School
Elementary · Grades PK–2 · 0.8 mi
M
Ferguson Middle SchoolC-
Middle · Grades 7–8 · 1.3 mi
H
McCluer High SchoolF
High · Grades 9–12 · 2.0 mi

District: Ferguson-Florissant School District

Neighborhood · ZIP 63135These 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.136
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.83
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.126

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.87%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.18%
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.18,386
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,955 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$61,061
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$76,146
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.39 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.57%

Owner Tools

Do you own this home?
Claim this home

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

21 S Hartnett 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 92% of homes in St. Louis County
  • Costs less per square foot than 95% of homes in St. Louis County
  • Smaller than 66% of homes in St. Louis County
  • Has a bigger lot than 69% of homes in Saint Louis 63135
  • Older than 89% of homes in St. Louis County

What homes are worth in Saint Louis 63135

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

This home
$44K$266K

This home is worth more than 40% of homes in Saint Louis 63135.

How it measures up in Saint Louis 63135

The dot is this home. The mark in the middle is the typical home in Saint Louis 63135.

Estimated value$86,772
CheaperTypical $95,176Pricier

Pricier than 40% of homes nearby

Price per ft²$75
CheaperTypical $88Pricier

Pricier than 22% of homes nearby

Living area1,163 ft²
SmallerTypical 1,064 ft²Bigger

Bigger than 60% of homes nearby

Lot size0.25 ac
SmallerTypical 0.19 acBigger

Bigger than 69% of homes nearby

Year built1937
OlderTypical 1952Newer

Newer than 15% of homes nearby

How 21 S Hartnett Ave ranks against every home in each area.
MeasureThis homeSaint Louis 63135St. Louis County
Estimated valuepricier than$86,77240% of homes8% of homes
Price per ft²pricier than$7522% of homes5% of homes
Living areabigger than1,163 ft²60% of homes34% of homes
Lot sizebigger than0.25 ac69% of homes66% of homes
Year builtnewer than193715% of homes11% of homes

About 21 S Hartnett Ave

How much is 21 S Hartnett Ave, Saint Louis, MO worth?

The TopHap Estimate for 21 S Hartnett Ave, Saint Louis, MO is $86,772 as of Aug 30, 2026. The likely range is $69,590 to $103,954. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 21 S Hartnett Ave, Saint Louis, MO?

21 S Hartnett Ave, Saint Louis, MO has 4 bedrooms, 2 bathrooms, 1,163 square feet of living space and a 0.25-acre lot.

When was 21 S Hartnett Ave, Saint Louis, MO built?

21 S Hartnett Ave, Saint Louis, MO was built in 1937, making it 89 years old. It is a bungalow home. The building has 1 story.

What schools serve 21 S Hartnett Ave, Saint Louis, MO?

21 S Hartnett Ave, Saint Louis, MO is assigned to Central Primary School (elementary); Ferguson Middle School (middle), rated C-; McCluer High School (high), rated F. All sit in Ferguson-Florissant School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 S Hartnett Ave, Saint Louis, MO compare to other homes in Saint Louis 63135?

Among the 8,029 homes in Saint Louis 63135, it is worth more than 40% of them ($86,772 against a typical $95,176), its price per square foot is higher than 22% of them ($75 against a typical $88), it is bigger than 60% of them (1,163 ft² against a typical 1,064 ft²), its lot is bigger than 69% of them (0.25 ac against a typical 0.19 ac) and it is newer than 15% of them (1937 against a typical 1952). Measured against all of St. Louis County, it is worth more than 8% 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 21 S Hartnett Ave, Saint Louis, MO?

The 2024 property tax bill for 21 S Hartnett Ave, Saint Louis, MO was $1,610. The county assessed it at $29,200.

More homes on S Hartnett Ave

Closest homes

More homes in Saint Louis 63135

Assigned schools

Explore the area

See this home in context

Open 21 S Hartnett Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map