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Duplex (2 Units, Any Combination)Residential
Last sold for $46,000 on Jul 28, 2009

20 ALLEN ST

GROTON, CT 06340
5
Beds
2
Baths
1,692 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.
0.18 ac
Lot SizeThe size of the land the home sits on, from county records.
1910
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$46,000 · Jul 28, 2009

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,624 (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.$194,530 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$101,920
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$92,610
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$194,530
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$136,171

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.30
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
5
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
48
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
81
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.
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
CountySOUTHEASTERN 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.2011
Lot (acres)The size of the land the home sits on, from county records.0.17
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Thames River Magnet SchoolC+
Elementary · Grades PK–5 · 1.1 mi
M
Groton Middle SchoolC
Middle · Grades 6–8 · 3.5 mi
H
Robert E. Fitch High SchoolC+
High · Grades 9–12 · 3.6 mi

District: Groton School District

Neighborhood · ZIP 06340These 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.104
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.109
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.56

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.91%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.23%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.6%
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.27,657
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.992 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$80,998
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$95,942
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

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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

20 Allen St 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.

  • Bigger than 65% of homes in Groton 06340
  • Has a smaller lot than 87% of homes in Southeastern Connecticut County
  • Older than 90% of homes in Groton 06340

How it measures up in Groton 06340

The dot is this home. The mark in the middle is the typical home in Groton 06340.

Living area1,692 ft²
SmallerTypical 1,414 ft²Bigger

Bigger than 65% of homes nearby

Lot size0.18 ac
SmallerTypical 0.28 acBigger

Bigger than 23% of homes nearby

Year built1910
OlderTypical 1961Newer

Newer than 10% of homes nearby

How 20 Allen St ranks against every home in each area.
MeasureThis homeGroton 06340Southeastern Connecticut County
Living areabigger than1,692 ft²65% of homes59% of homes
Lot sizebigger than0.18 ac23% of homes13% of homes
Year builtnewer than191010% of homes13% of homes

About 20 Allen St

When did 20 Allen St, Groton, CT last sell?

20 Allen St, Groton, CT last sold on Jul 28, 2009 for $46,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 20 Allen St, Groton, CT?

20 Allen St, Groton, CT has 5 bedrooms, 2 bathrooms, 1,692 square feet of living space and a 0.17-acre lot.

When was 20 Allen St, Groton, CT built?

20 Allen St, Groton, CT was built in 1910, making it 116 years old. It is a duplex single home. The building has 2 stories.

What schools serve 20 Allen St, Groton, CT?

20 Allen St, Groton, CT is assigned to Thames River Magnet School (elementary), rated C+; Groton Middle School (middle), rated C; Robert E. Fitch High School (high), rated C+. All sit in Groton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Allen St, Groton, CT compare to other homes in Groton 06340?

Among the 7,236 homes in Groton 06340, it is bigger than 65% of them (1,692 ft² against a typical 1,414 ft²), its lot is bigger than 23% of them (0.18 ac against a typical 0.28 ac) and it is newer than 10% of them (1910 against a typical 1961). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 20 Allen St, Groton, CT?

The 2025 property tax bill for 20 Allen St, Groton, CT was $5,624. The county assessed it at $194,530.

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