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CondominiumResidential
$427,320$155 / 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 Sep 24, 2026
Last sold for $425,000 on Apr 18, 2025

543 BOULDER RIVER DR

O FALLON, MO 63368
3
Beds
3 / 2
Baths
2,758 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.
0.14 ac
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.
2
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

$427K
$394K low$460K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$425,000 · Apr 18, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,506 (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.$54,982 (2026)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$54,862
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$289,380

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.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.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.Bi-Level
CountyST. CHARLES
Lot (acres)The size of the land the home sits on, from county records.0.14
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 · 268 ft²Porch · 28 ft²

Transaction History(3)

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
Francis Howell Middle SchoolA-
Middle · Grades 6–8 · 0.9 mi
E
John Weldon Elementary SchoolC
Elementary · Grades PK–5 · 1.5 mi
H
Francis Howell High SchoolA+
High · Grades 9–12 · 1.8 mi

District: Francis Howell R-Iii School District

Neighborhood · ZIP 63368These 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.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.76
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.100

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.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.2%
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.49,861
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,210 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$119,542
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$138,192
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%

Owner Tools

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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

543 Boulder River 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.

  • Worth more than 68% of homes in St. Charles County
  • Costs less per square foot than 77% of homes in O Fallon 63368
  • Bigger than 77% of homes in St. Charles County
  • Has a smaller lot than 86% of homes in O Fallon 63368
  • Newer than 65% of homes in St. Charles County

What homes are worth in O Fallon 63368

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

This home
$198K$778K

This home is worth more than 53% of homes in O Fallon 63368.

How it measures up in O Fallon 63368

The dot is this home. The mark in the middle is the typical home in O Fallon 63368.

Estimated value$427,320
CheaperTypical $417,171Pricier

Pricier than 53% of homes nearby

Price per ft²$155
CheaperTypical $183Pricier

Pricier than 23% of homes nearby

Living area2,758 ft²
SmallerTypical 2,355 ft²Bigger

Bigger than 66% of homes nearby

Lot size0.14 ac
SmallerTypical 0.23 acBigger

Bigger than 14% of homes nearby

Year built2001
OlderTypical 2000Newer

Newer than 61% of homes nearby

How 543 Boulder River Dr ranks against every home in each area.
MeasureThis homeO Fallon 63368St. Charles County
Estimated valuepricier than$427,32053% of homes68% of homes
Price per ft²pricier than$15523% of homes24% of homes
Living areabigger than2,758 ft²66% of homes77% of homes
Lot sizebigger than0.14 ac14% of homes16% of homes
Year builtnewer than200161% of homes65% of homes

About 543 Boulder River Dr

How much is 543 Boulder River Dr, O Fallon, MO worth?

The TopHap Estimate for 543 Boulder River Dr, O Fallon, MO is $427,320 as of Sep 24, 2026. The likely range is $394,321 to $460,319. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 543 Boulder River Dr, O Fallon, MO last sell?

543 Boulder River Dr, O Fallon, MO last sold on Apr 18, 2025 for $425,000, according to the county's recorded deed.

How big is 543 Boulder River Dr, O Fallon, MO?

543 Boulder River Dr, O Fallon, MO has 3 bedrooms, 3 bathrooms, 2,758 square feet of living space and a 0.14-acre lot.

When was 543 Boulder River Dr, O Fallon, MO built?

543 Boulder River Dr, O Fallon, MO was built in 2001, making it 25 years old. It is a bi-level home. The building has 2 stories.

What schools serve 543 Boulder River Dr, O Fallon, MO?

543 Boulder River Dr, O Fallon, MO is assigned to Francis Howell Middle School (middle), rated A-; John Weldon Elementary School (elementary), rated C; Francis Howell High School (high), rated A+. All sit in Francis Howell R-Iii School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 543 Boulder River Dr, O Fallon, MO compare to other homes in O Fallon 63368?

Among the 15,024 homes in O Fallon 63368, it is worth more than 53% of them ($427,320 against a typical $417,171), its price per square foot is higher than 23% of them ($155 against a typical $183), it is bigger than 66% of them (2,758 ft² against a typical 2,355 ft²), its lot is bigger than 14% of them (0.14 ac against a typical 0.23 ac) and it is newer than 61% of them (2001 against a typical 2000). Measured against all of St. Charles County, it is worth more than 68% 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 543 Boulder River Dr, O Fallon, MO?

The 2025 property tax bill for 543 Boulder River Dr, O Fallon, MO was $3,506. The county assessed it at $54,982.

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