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Single Family ResidenceResidential
$7,879,100
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 88How 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 $7,500,000 on Jan 22, 2026

577 ROUND HILL RD

GREENWICH, CT 06831
0
Baths
6.58 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$7.9M
$6.9M low$8.8M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$7,500,000 · Jan 22, 2026

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$58,336 (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.$4,845,190 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,824,130
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$3,021,060
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$4,845,190
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$3,391,633

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.42
14
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
23
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
64
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
94
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
16
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
CountyWESTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.6.58
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.Pool W/Hot Tub/Spa
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Tennis court

Transaction History(7)

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
Parkway SchoolA
Elementary · Grades KG–5 · 0.9 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 6.2 mi
M
Western Middle SchoolA-
Middle · Grades 6–8 · 7.6 mi

District: Greenwich School District

Neighborhood · ZIP 06831These 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.76
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.112
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.105

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.89%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.5.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.17,909
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.648 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$210,519
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$312,404
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.51 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

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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

577 Round Hill Rd 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 Western Connecticut County
  • Among the largest lots in Western Connecticut County

What homes are worth in Greenwich 06831

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

This home
$678K$10M

This home is worth more than 92% of homes in Greenwich 06831.

How it measures up in Greenwich 06831

The dot is this home. The mark in the middle is the typical home in Greenwich 06831.

Estimated value$7,879,100
CheaperTypical $2,190,225Pricier

Pricier than 92% of homes nearby

Lot size6.58 ac
SmallerTypical 1.35 acBigger

Bigger than 95% of homes nearby

How 577 Round Hill Rd ranks against every home in each area.
MeasureThis homeGreenwich 06831Western Connecticut County
Estimated valuepricier than$7,879,10092% of homesalmost all homes
Lot sizebigger than6.58 ac95% of homesalmost all homes

About 577 Round Hill Rd

How much is 577 Round Hill Rd, Greenwich, CT worth?

The TopHap Estimate for 577 Round Hill Rd, Greenwich, CT is $7,879,100 as of Sep 24, 2026. The likely range is $6,946,985 to $8,811,215. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 577 Round Hill Rd, Greenwich, CT last sell?

577 Round Hill Rd, Greenwich, CT last sold on Jan 22, 2026 for $7,500,000, according to the county's recorded deed. TopHap holds 6 recorded sales for this parcel.

What schools serve 577 Round Hill Rd, Greenwich, CT?

577 Round Hill Rd, Greenwich, CT is assigned to Parkway School (elementary), rated A; Greenwich High School (high), rated A+; Western Middle School (middle), rated A-. All sit in Greenwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 577 Round Hill Rd, Greenwich, CT compare to other homes in Greenwich 06831?

Among the 5,196 homes in Greenwich 06831, it is worth more than 92% of them ($7,879,100 against a typical $2,190,225) and its lot is bigger than 95% of them (6.58 ac against a typical 1.35 ac). Measured against all of Western Connecticut County, it is worth more than almost all 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 577 Round Hill Rd, Greenwich, CT?

The 2025 property tax bill for 577 Round Hill Rd, Greenwich, CT was $58,336. The county assessed it at $4,845,190.

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