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Single Family ResidenceResidential
$1,896,582$360 / 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 90How 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

30 CIRCLE AVE

GROTON, CT 06340
5
Beds
4.5
Baths
5,264 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.
0.6 ac
Lot SizeThe size of the land the home sits on, from county records.
1899
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
14
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.9M
$1.7M low$2.1M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$36,327 (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.$1,256,570 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$703,899
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$552,671
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,256,570
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$879,599

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.50
88
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.
50
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
80
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
29
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.179 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.79%
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
CountySOUTHEASTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.60
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Steam
FireplaceWhether the home has a fireplace, and what kind.Yes
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.DeckElevator

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.

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

E
Catherine Kolnaski STEAM Magnet SchoolB+
Elementary · Grades PK–5 · 1.6 mi
M
Groton Middle SchoolC
Middle · Grades 6–8 · 3.4 mi
H
Robert E. Fitch High SchoolC
High · Grades 9–12 · 3.5 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

30 Circle 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.

  • Among the most valuable homes in Southeastern Connecticut County
  • Costs more per square foot than 83% of homes in Southeastern Connecticut County
  • Among the largest homes in Groton 06340
  • Has a bigger lot than 85% of homes in Groton 06340
  • Older than 94% of homes in Groton 06340

What homes are worth in Groton 06340

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

This home
$182K$2.1M

This home is worth more than 97% 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.

Estimated value$1,896,582
CheaperTypical $385,579Pricier

Pricier than 97% of homes nearby

Price per ft²$360
CheaperTypical $289Pricier

Pricier than 75% of homes nearby

Living area5,264 ft²
SmallerTypical 1,425 ft²Bigger

Bigger than almost all homes nearby

Lot size0.6 ac
SmallerTypical 0.28 acBigger

Bigger than 85% of homes nearby

Year built1899
OlderTypical 1961Newer

Newer than 6% of homes nearby

How 30 Circle Ave ranks against every home in each area.
MeasureThis homeGroton 06340Southeastern Connecticut County
Estimated valuepricier than$1,896,58297% of homesalmost all homes
Price per ft²pricier than$36075% of homes83% of homes
Living areabigger than5,264 ft²almost all homesalmost all homes
Lot sizebigger than0.6 ac85% of homes55% of homes
Year builtnewer than18996% of homes8% of homes

About 30 Circle Ave

How much is 30 Circle Ave, Groton, CT worth?

The TopHap Estimate for 30 Circle Ave, Groton, CT is $1,896,582 as of Sep 24, 2026. The likely range is $1,712,845 to $2,080,319. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 30 Circle Ave, Groton, CT last sell?

30 Circle Ave, Groton, CT last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 30 Circle Ave, Groton, CT?

30 Circle Ave, Groton, CT has 5 bedrooms, 4.5 bathrooms, 5,264 square feet of living space and a 0.60-acre lot.

When was 30 Circle Ave, Groton, CT built?

30 Circle Ave, Groton, CT was built in 1899, making it 127 years old. The building has 2 stories.

What schools serve 30 Circle Ave, Groton, CT?

30 Circle Ave, Groton, CT is assigned to Catherine Kolnaski STEAM Magnet School (elementary), rated B+; 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 30 Circle Ave, Groton, CT compare to other homes in Groton 06340?

Among the 7,236 homes in Groton 06340, it is worth more than 97% of them ($1,896,582 against a typical $385,579), its price per square foot is higher than 75% of them ($360 against a typical $289), it is bigger than almost all of them (5,264 ft² against a typical 1,425 ft²), its lot is bigger than 85% of them (0.6 ac against a typical 0.28 ac) and it is newer than 6% of them (1899 against a typical 1961). Measured against all of Southeastern 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 30 Circle Ave, Groton, CT?

The 2025 property tax bill for 30 Circle Ave, Groton, CT was $36,327. The county assessed it at $1,256,570.

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