Skip to content
Skip to content
TopHapOpen in map
Duplex (2 Units, Any Combination)Residential
Last sold for $340,000 on Jan 10, 2013

21 HAROLD AVE

GREENWICH, CT 06830
4
Beds
2
Baths
1,780 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.
0.17 ac
Lot SizeThe size of the land the home sits on, from county records.
1907
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$340,000 · Jan 10, 2013

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,926 (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.$479,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$348,670
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$130,830
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$479,500
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$335,650

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.54
55
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
7
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
65
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.
49
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.19 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.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyWESTERN CONNECTICUT
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1960
Lot (acres)The size of the land the home sits on, from county records.0.17
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(9)

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
Hamilton Avenue SchoolB-
Elementary · Grades PK–5 · 0.1 mi
M
Western Middle SchoolA
Middle · Grades 6–8 · 0.7 mi
H
Greenwich High SchoolA+
High · Grades 9–12 · 2.1 mi

District: Greenwich School District

Neighborhood · ZIP 06830These 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.110
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.119
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.104

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.90%
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.7.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.27,704
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,501 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$168,325
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$273,728
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Owner Tools

Do you own this home?
Claim this home

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 Harold Ave 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.

  • Smaller than 78% of homes in Greenwich 06830
  • Has a smaller lot than 88% of homes in Western Connecticut County
  • Older than 94% of homes in Western Connecticut County

How it measures up in Greenwich 06830

The dot is this home. The mark in the middle is the typical home in Greenwich 06830.

Living area1,780 ft²
SmallerTypical 2,921 ft²Bigger

Bigger than 22% of homes nearby

Lot size0.17 ac
SmallerTypical 0.46 acBigger

Bigger than 22% of homes nearby

Year built1907
OlderTypical 1956Newer

Newer than 11% of homes nearby

How 21 Harold Ave ranks against every home in each area.
MeasureThis homeGreenwich 06830Western Connecticut County
Living areabigger than1,780 ft²22% of homes43% of homes
Lot sizebigger than0.17 ac22% of homes12% of homes
Year builtnewer than190711% of homes6% of homes

About 21 Harold Ave

When did 21 Harold Ave, Greenwich, CT last sell?

21 Harold Ave, Greenwich, CT last sold on Jan 10, 2013 for $340,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 21 Harold Ave, Greenwich, CT?

21 Harold Ave, Greenwich, CT has 4 bedrooms, 2 bathrooms, 1,780 square feet of living space and a 0.17-acre lot.

When was 21 Harold Ave, Greenwich, CT built?

21 Harold Ave, Greenwich, CT was built in 1907, making it 119 years old. It is a duplex single home. The building has 2 stories.

What schools serve 21 Harold Ave, Greenwich, CT?

21 Harold Ave, Greenwich, CT is assigned to Hamilton Avenue School (elementary), rated B-; Western Middle School (middle), rated A; Greenwich High School (high), rated A+. All sit in Greenwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Harold Ave, Greenwich, CT compare to other homes in Greenwich 06830?

Among the 6,738 homes in Greenwich 06830, it is bigger than 22% of them (1,780 ft² against a typical 2,921 ft²), its lot is bigger than 22% of them (0.17 ac against a typical 0.46 ac) and it is newer than 11% of them (1907 against a typical 1956). 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 Harold Ave, Greenwich, CT?

The 2025 property tax bill for 21 Harold Ave, Greenwich, CT was $5,926. The county assessed it at $479,500.

More homes on Harold Ave

Closest homes

More homes in Greenwich 06830

Assigned schools

Explore the area

See this home in context

Open 21 Harold Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map