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Single Family ResidenceResidential
$950,124$885 / 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 98How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Jul 14, 2026
Last sold for $260,000 on Oct 17, 2000

18 PROSPECT ST

GROTON, CT 06340
4
Beds
1
Baths
1,074 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1924
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
6
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$950K
$928K low$972K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$260,000 · Oct 17, 2000
Est. Owner EquityRoughly how much of the home's value the owner would keep after paying off known loans. It is our estimate minus the loans still owed.$510,124
Est. Lendable EquityThe part of the owner's equity a lender would typically let them borrow against — about 80% of their equity.$408,099
Loan-to-ValueHow much is still owed on the home compared to what it is worth. 80% means loans equal 80% of our estimate, so it shifts when the estimate does.50%
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$340,000
CITIZENS BANK · R · recorded Dec 29, 2022
2nd MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$100,000
AMERIHOME MORTGAGE CO LLC

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$12,699 (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.$450,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$395,626
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$55,174
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$450,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$315,560

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.36 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.49%
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.0.2 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.0.23
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.None
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(8)

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.

H
Robert E. Fitch High SchoolC
High · Grades 9–12 · 2.0 mi
M
Groton Middle SchoolC
Middle · Grades 6–8 · 2.3 mi
E
Mystic River Magnet SchoolC
Elementary · Grades PK–5 · 2.5 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%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

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

18 Prospect 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.

  • Worth more than 96% of homes in Southeastern Connecticut County
  • Among the highest price per square foot in Southeastern Connecticut County
  • Smaller than 81% of homes in Southeastern Connecticut County
  • Has a smaller lot than 80% of homes in Southeastern Connecticut County
  • Older than 84% 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
$198K$1.8M

This home is worth more than 89% 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$950,124
CheaperTypical $390,405Pricier

Pricier than 89% of homes nearby

Price per ft²$885
CheaperTypical $286Pricier

Pricier than almost all homes nearby

Living area1,074 ft²
SmallerTypical 1,425 ft²Bigger

Bigger than 25% of homes nearby

Lot size0.23 ac
SmallerTypical 0.28 acBigger

Bigger than 37% of homes nearby

Year built1924
OlderTypical 1960Newer

Newer than 16% of homes nearby

How 18 Prospect St ranks against every home in each area.
MeasureThis homeGroton 06340Southeastern Connecticut County
Estimated valuepricier than$950,12489% of homes96% of homes
Price per ft²pricier than$885almost all homesalmost all homes
Living areabigger than1,074 ft²25% of homes19% of homes
Lot sizebigger than0.23 ac37% of homes20% of homes
Year builtnewer than192416% of homes16% of homes

About 18 Prospect St

How much is 18 Prospect St, Groton, CT worth?

The TopHap Estimate for 18 Prospect St, Groton, CT is $950,124 as of Jul 14, 2026. The likely range is $928,256 to $971,992. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 18 Prospect St, Groton, CT last sell?

18 Prospect St, Groton, CT last sold on Oct 17, 2000 for $260,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 18 Prospect St, Groton, CT?

18 Prospect St, Groton, CT has 4 bedrooms, 1 bathrooms, 1,074 square feet of living space and a 0.23-acre lot.

When was 18 Prospect St, Groton, CT built?

18 Prospect St, Groton, CT was built in 1924, making it 102 years old. The building has 1 story.

What schools serve 18 Prospect St, Groton, CT?

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

How does 18 Prospect St, Groton, CT compare to other homes in Groton 06340?

Among the 7,236 homes in Groton 06340, it is worth more than 89% of them ($950,124 against a typical $390,405), its price per square foot is higher than almost all of them ($885 against a typical $286), it is bigger than 25% of them (1,074 ft² against a typical 1,425 ft²), its lot is bigger than 37% of them (0.23 ac against a typical 0.28 ac) and it is newer than 16% of them (1924 against a typical 1960). Measured against all of Southeastern Connecticut 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 18 Prospect St, Groton, CT?

The 2025 property tax bill for 18 Prospect St, Groton, CT was $12,699. The county assessed it at $450,800.

Closest homes

More homes in Groton 06340

Assigned schools

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