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Single Family ResidenceResidential
$596,428$228 / 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 92How 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
Last sold for $842,105 on Jan 5, 2026

100 RIVER GROVE CT

O FALLON, MO 63366
3
Beds
2.5
Baths
2,616 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.
1.12 ac
Lot SizeThe size of the land the home sits on, from county records.
2025
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$596K
$547K low$646K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$842,105 · Jan 5, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$789 (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.$160,000 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$13,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$842,105

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
14
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
33
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
83
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
70
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.2 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
CountyST. CHARLES
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
Mount Hope Elementary SchoolC
Elementary · Grades KG–5 · 3.1 mi
H
Fort Zumwalt North High SchoolA+
High · Grades 9–12 · 5.8 mi
M
Fort Zumwalt North Middle SchoolA-
Middle · Grades 6–8 · 6.0 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

100 River Grove Ct 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 94% of homes in O Fallon 63366
  • Costs more per square foot than 82% of homes in St. Charles County
  • Bigger than 79% of homes in O Fallon 63366
  • Has a bigger lot than 94% of homes in St. Charles County
  • Among the newest homes in O Fallon 63366

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
$191K$730K

This home is worth more than 94% 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$596,428
CheaperTypical $349,867Pricier

Pricier than 94% of homes nearby

Price per ft²$228
CheaperTypical $188Pricier

Pricier than 79% of homes nearby

Living area2,616 ft²
SmallerTypical 1,838 ft²Bigger

Bigger than 79% of homes nearby

Lot size1.12 ac
SmallerTypical 0.23 acBigger

Bigger than 92% of homes nearby

Year built2025
OlderTypical 1999Newer

Newer than almost all homes nearby

How 100 River Grove Ct ranks against every home in each area.
MeasureThis homeO Fallon 63366St. Charles County
Estimated valuepricier than$596,42894% of homes90% of homes
Price per ft²pricier than$22879% of homes82% of homes
Living areabigger than2,616 ft²79% of homes73% of homes
Lot sizebigger than1.12 ac92% of homes94% of homes
Year builtnewer than2025almost all homesalmost all homes

About 100 River Grove Ct

How much is 100 River Grove Ct, O Fallon, MO worth?

The TopHap Estimate for 100 River Grove Ct, O Fallon, MO is $596,428 as of Aug 30, 2026. The likely range is $546,809 to $646,047. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 100 River Grove Ct, O Fallon, MO last sell?

100 River Grove Ct, O Fallon, MO last sold on Jan 5, 2026 for $842,105, according to the county's recorded deed.

How big is 100 River Grove Ct, O Fallon, MO?

100 River Grove Ct, O Fallon, MO has 3 bedrooms, 2.5 bathrooms and 2,616 square feet of living space.

When was 100 River Grove Ct, O Fallon, MO built?

100 River Grove Ct, O Fallon, MO was built in 2025, making it 1 years old. It is a bi-level home. The building has 2 stories.

What schools serve 100 River Grove Ct, O Fallon, MO?

100 River Grove Ct, O Fallon, MO is assigned to Mount Hope Elementary School (elementary), rated C; Fort Zumwalt North High School (high), rated A+; Fort Zumwalt North Middle School (middle), 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 100 River Grove Ct, 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 94% of them ($596,428 against a typical $349,867), its price per square foot is higher than 79% of them ($228 against a typical $188), it is bigger than 79% of them (2,616 ft² against a typical 1,838 ft²), its lot is bigger than 92% of them (1.12 ac against a typical 0.23 ac) and it is newer than almost all of them (2025 against a typical 1999). Measured against all of St. Charles County, it is worth more than 90% 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 100 River Grove Ct, O Fallon, MO?

The 2025 property tax bill for 100 River Grove Ct, O Fallon, MO was $789. The county assessed it at $160,000.

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