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Single Family ResidenceResidential
$1,673,595$794 / 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 88How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $1,900,000 on Sep 28, 2023

5 UNION ST

STONINGTON, CT 06378
3
Beds
4.5
Baths
2,109 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.
3,485 ft²
Lot SizeThe size of the land the home sits on, from county records.
1890
Year BuiltThe year the home was originally built, according to county records.
2
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

$1.7M
$1.5M low$1.9M high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$1,900,000 · Sep 28, 2023

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$11,399 (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.$560,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$227,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$332,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$560,300
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$392,210

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.51
89
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.
51
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.
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.109 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.92%
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
StyleThe architectural style of the home, such as ranch or colonial.Conventional
CountySOUTHEASTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.08
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
CoolingThe type of cooling or air conditioning in the home.Yes
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
Dean's Mill Elementary SchoolA
Elementary · Grades KG–5 · 2.2 mi
M
Stonington Middle SchoolB
Middle · Grades 6–8 · 2.6 mi
H
Stonington High SchoolB+
High · Grades 9–12 · 3.3 mi

District: Stonington School District

Neighborhood · ZIP 06378These 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.66
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.103
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.57

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.85%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.32%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.4%
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.5,226
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.211 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$113,016
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$159,008
Average tempThe average temperature here across a full year.50°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

5 Union 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.

  • Among the most valuable homes in Southeastern Connecticut County
  • Among the highest price per square foot in Southeastern Connecticut County
  • Bigger than 76% of homes in Southeastern Connecticut County
  • Among the smallest lots in Southeastern Connecticut County
  • Older than 93% of homes in Southeastern Connecticut County

What homes are worth in Stonington 06378

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

This home
$361K$3.1M

This home is worth more than 89% of homes in Stonington 06378.

How it measures up in Stonington 06378

The dot is this home. The mark in the middle is the typical home in Stonington 06378.

Estimated value$1,673,595
CheaperTypical $847,213Pricier

Pricier than 89% of homes nearby

Price per ft²$794
CheaperTypical $422Pricier

Pricier than 90% of homes nearby

Living area2,109 ft²
SmallerTypical 1,862 ft²Bigger

Bigger than 60% of homes nearby

Lot size3,485 ft²
SmallerTypical 0.93 acBigger

Bigger than 9% of homes nearby

Year built1890
OlderTypical 1970Newer

Newer than 13% of homes nearby

How 5 Union St ranks against every home in each area.
MeasureThis homeStonington 06378Southeastern Connecticut County
Estimated valuepricier than$1,673,59589% of homesalmost all homes
Price per ft²pricier than$79490% of homesalmost all homes
Living areabigger than2,109 ft²60% of homes76% of homes
Lot sizebigger than3,485 ft²9% of homesalmost no homes
Year builtnewer than189013% of homes7% of homes

About 5 Union St

How much is 5 Union St, Stonington, CT worth?

The TopHap Estimate for 5 Union St, Stonington, CT is $1,673,595 as of Aug 30, 2026. The likely range is $1,464,977 to $1,882,213. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 5 Union St, Stonington, CT last sell?

5 Union St, Stonington, CT last sold on Sep 28, 2023 for $1,900,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 5 Union St, Stonington, CT?

5 Union St, Stonington, CT has 3 bedrooms, 4.5 bathrooms, 2,109 square feet of living space and a 0.08-acre lot.

When was 5 Union St, Stonington, CT built?

5 Union St, Stonington, CT was built in 1890, making it 136 years old. It is a conventional home. The building has 2 stories.

What schools serve 5 Union St, Stonington, CT?

5 Union St, Stonington, CT is assigned to Dean's Mill Elementary School (elementary), rated A; Stonington Middle School (middle), rated B; Stonington High School (high), rated B+. All sit in Stonington School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 5 Union St, Stonington, CT compare to other homes in Stonington 06378?

Among the 2,941 homes in Stonington 06378, it is worth more than 89% of them ($1,673,595 against a typical $847,213), its price per square foot is higher than 90% of them ($794 against a typical $422), it is bigger than 60% of them (2,109 ft² against a typical 1,862 ft²), its lot is bigger than 9% of them (3,485 ft² against a typical 0.93 ac) and it is newer than 13% of them (1890 against a typical 1970). 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 5 Union St, Stonington, CT?

The 2025 property tax bill for 5 Union St, Stonington, CT was $11,399. The county assessed it at $560,300.

More homes on Union St

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