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Single Family ResidenceResidential
$689,501$175 / 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 Aug 30, 2026

204 RIVER ROCK DR

UNION, MO 63084
4
Beds
4
Baths
3,949 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.
5.1 ac
Lot SizeThe size of the land the home sits on, from county records.
2009
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$690K
$650K low$729K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,376 (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.$101,807 (2025)
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$92,945
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$536,160

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.67
100
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
43
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
80
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
68
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
47
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.197 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.1 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
CountyFranklin
Lot (acres)The size of the land the home sits on, from county records.5.10
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.None
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Yes

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.

Foreclosure Filings(1)

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Central Elementary SchoolB
Elementary · Grades KG–3 · 1.1 mi
M
Union Middle SchoolA
Middle · Grades 7–8 · 1.3 mi
H
Union High SchoolC+
High · Grades 9–12 · 1.4 mi

District: Union R-Xi School District

Neighborhood · ZIP 63084These 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.107
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.79
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.99

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.14%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.5%
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.20,185
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.264 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$71,520
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$83,433
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

204 River Rock 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.

  • Among the most valuable homes in Union 63084
  • Costs less per square foot than 74% of homes in Union 63084
  • Among the largest homes in Union 63084
  • Has a bigger lot than 87% of homes in Union 63084
  • Newer than 89% of homes in Franklin County

What homes are worth in Union 63084

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

This home
$89K$642K

This home is worth more than almost all homes in Union 63084.

How it measures up in Union 63084

The dot is this home. The mark in the middle is the typical home in Union 63084.

Estimated value$689,501
CheaperTypical $269,038Pricier

Pricier than almost all homes nearby

Price per ft²$175
CheaperTypical $201Pricier

Pricier than 26% of homes nearby

Living area3,949 ft²
SmallerTypical 1,335 ft²Bigger

Bigger than almost all homes nearby

Lot size5.1 ac
SmallerTypical 0.5 acBigger

Bigger than 87% of homes nearby

Year built2009
OlderTypical 1989Newer

Newer than 87% of homes nearby

How 204 River Rock Dr ranks against every home in each area.
MeasureThis homeUnion 63084Franklin County
Estimated valuepricier than$689,501almost all homes96% of homes
Price per ft²pricier than$17526% of homes31% of homes
Living areabigger than3,949 ft²almost all homes98% of homes
Lot sizebigger than5.1 ac87% of homes78% of homes
Year builtnewer than200987% of homes89% of homes

About 204 River Rock Dr

How much is 204 River Rock Dr, Union, MO worth?

The TopHap Estimate for 204 River Rock Dr, Union, MO is $689,501 as of Aug 30, 2026. The likely range is $650,067 to $728,935. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 204 River Rock Dr, Union, MO last sell?

204 River Rock Dr, Union, MO last sold on Nov 18, 2005, according to the county's recorded deed.

How big is 204 River Rock Dr, Union, MO?

204 River Rock Dr, Union, MO has 4 bedrooms, 4 bathrooms, 3,949 square feet of living space and a 5.10-acre lot.

When was 204 River Rock Dr, Union, MO built?

204 River Rock Dr, Union, MO was built in 2009, making it 17 years old. The building has 2 stories.

What schools serve 204 River Rock Dr, Union, MO?

204 River Rock Dr, Union, MO is assigned to Central Elementary School (elementary), rated B; Union Middle School (middle), rated A; Union High School (high), rated C+. All sit in Union R-Xi School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 204 River Rock Dr, Union, MO compare to other homes in Union 63084?

Among the 7,103 homes in Union 63084, it is worth more than almost all of them ($689,501 against a typical $269,038), its price per square foot is higher than 26% of them ($175 against a typical $201), it is bigger than almost all of them (3,949 ft² against a typical 1,335 ft²), its lot is bigger than 87% of them (5.1 ac against a typical 0.5 ac) and it is newer than 87% of them (2009 against a typical 1989). Measured against all of Franklin County, it is worth more than 96% 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 204 River Rock Dr, Union, MO?

The 2025 property tax bill for 204 River Rock Dr, Union, MO was $5,376. The county assessed it at $101,807.

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