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CondominiumResidential
$393,605$172 / 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 94How 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 $345,000 on Sep 20, 2023

21 AUTUMN RIDGE DR

O FALLON, MO 63366
2
Beds
3
Baths
2,283 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.
3,920 ft²
Lot SizeThe size of the land the home sits on, from county records.
2001
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.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$394K
$371K low$416K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$345,000 · Sep 20, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,960 (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.$61,635 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$59,260
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$324,396

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.14 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.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Spanish
CountyST. CHARLES
Lot (acres)The size of the land the home sits on, from county records.0.09
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.DeckPatio · 81 ft²Porch · 111 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
Westhoff Elementary SchoolA-
Elementary · Grades KG–5 · 1.2 mi
M
Fort Zumwalt North Middle SchoolA
Middle · Grades 6–8 · 2.0 mi
H
Fort Zumwalt North High SchoolA+
High · Grades 9–12 · 2.3 mi

District: Fort Zumwalt R-Ii School District

Neighborhood · ZIP 63366These 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.86
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.75
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.95

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.22%
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.1.0%
PopulationHow many people live in this area.53,503
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.756 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$93,639
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$109,885
Average tempThe average temperature here across a full year.55°F
Annual precipHow much rain and melted snow falls here in a typical year.40 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

21 Autumn Ridge 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.

  • Bigger than 68% of homes in O Fallon 63366
  • Has a smaller lot than 94% of homes in O Fallon 63366
  • Newer than 65% of homes in St. Charles County

What homes are worth in O Fallon 63366

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

This home
$196K$776K

This home is worth more than 64% of homes in O Fallon 63366.

How it measures up in O Fallon 63366

The dot is this home. The mark in the middle is the typical home in O Fallon 63366.

Estimated value$393,605
CheaperTypical $351,002Pricier

Pricier than 64% of homes nearby

Price per ft²$172
CheaperTypical $187Pricier

Pricier than 38% of homes nearby

Living area2,283 ft²
SmallerTypical 1,834 ft²Bigger

Bigger than 68% of homes nearby

Lot size3,920 ft²
SmallerTypical 0.23 acBigger

Bigger than 6% of homes nearby

Year built2001
OlderTypical 1999Newer

Newer than 62% of homes nearby

How 21 Autumn Ridge Dr ranks against every home in each area.
MeasureThis homeO Fallon 63366St. Charles County
Estimated valuepricier than$393,60564% of homes59% of homes
Price per ft²pricier than$17238% of homes39% of homes
Living areabigger than2,283 ft²68% of homes61% of homes
Lot sizebigger than3,920 ft²6% of homes10% of homes
Year builtnewer than200162% of homes65% of homes

About 21 Autumn Ridge Dr

How much is 21 Autumn Ridge Dr, O Fallon, MO worth?

The TopHap Estimate for 21 Autumn Ridge Dr, O Fallon, MO is $393,605 as of Sep 24, 2026. The likely range is $370,898 to $416,312. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Autumn Ridge Dr, O Fallon, MO last sell?

21 Autumn Ridge Dr, O Fallon, MO last sold on Sep 20, 2023 for $345,000, according to the county's recorded deed.

How big is 21 Autumn Ridge Dr, O Fallon, MO?

21 Autumn Ridge Dr, O Fallon, MO has 2 bedrooms, 3 bathrooms, 2,283 square feet of living space and a 0.09-acre lot.

When was 21 Autumn Ridge Dr, O Fallon, MO built?

21 Autumn Ridge Dr, O Fallon, MO was built in 2001, making it 25 years old. It is a spanish home. The building has 1 story.

What schools serve 21 Autumn Ridge Dr, O Fallon, MO?

21 Autumn Ridge Dr, O Fallon, MO is assigned to Westhoff Elementary School (elementary), rated A-; Fort Zumwalt North Middle School (middle), rated A; Fort Zumwalt North High School (high), rated A+. All sit in Fort Zumwalt R-Ii School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Autumn Ridge Dr, O Fallon, MO compare to other homes in O Fallon 63366?

Among the 17,886 homes in O Fallon 63366, it is worth more than 64% of them ($393,605 against a typical $351,002), its price per square foot is higher than 38% of them ($172 against a typical $187), it is bigger than 68% of them (2,283 ft² against a typical 1,834 ft²), its lot is bigger than 6% of them (3,920 ft² against a typical 0.23 ac) and it is newer than 62% of them (2001 against a typical 1999). Measured against all of St. Charles County, it is worth more than 59% 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 Autumn Ridge Dr, O Fallon, MO?

The 2025 property tax bill for 21 Autumn Ridge Dr, O Fallon, MO was $3,960. The county assessed it at $61,635.

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