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Single Family ResidenceResidential
$672,438$763 / 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 78How 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 $170,000 on Aug 23, 1999

12 UNION ST

STONINGTON, CT 06378
2
Beds
2
Baths
881 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.
1,307 ft²
Lot SizeThe size of the land the home sits on, from county records.
1774
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$672K
$523K low$822K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$170,000 · Aug 23, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$6,268 (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.$308,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$175,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$133,100
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$308,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$215,670

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.52
91
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
8
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.48 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.72%
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.Historical
CountySOUTHEASTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.0.03
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(3)

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 · 3.2 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

12 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.

  • Worth more than 87% of homes in Southeastern Connecticut County
  • Among the highest price per square foot in Southeastern Connecticut County
  • Smaller than 95% of homes in Stonington 06378
  • Among the smallest lots in Stonington 06378
  • Among the oldest homes in Stonington 06378

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 32% 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$672,438
CheaperTypical $847,213Pricier

Pricier than 32% of homes nearby

Price per ft²$763
CheaperTypical $422Pricier

Pricier than 89% of homes nearby

Living area881 ft²
SmallerTypical 1,862 ft²Bigger

Bigger than 5% of homes nearby

Lot size1,307 ft²
SmallerTypical 0.93 acBigger

Smaller than almost all homes nearby

Year built1774
OlderTypical 1970Newer

Older than almost all homes nearby

How 12 Union St ranks against every home in each area.
MeasureThis homeStonington 06378Southeastern Connecticut County
Estimated valuepricier than$672,43832% of homes87% of homes
Price per ft²pricier than$76389% of homesalmost all homes
Living areabigger than881 ft²5% of homes6% of homes
Lot sizebigger than1,307 ft²almost no homesalmost no homes
Year builtnewer than1774almost no homesalmost no homes

About 12 Union St

How much is 12 Union St, Stonington, CT worth?

The TopHap Estimate for 12 Union St, Stonington, CT is $672,438 as of Aug 30, 2026. The likely range is $522,870 to $822,006. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12 Union St, Stonington, CT last sell?

12 Union St, Stonington, CT last sold on Aug 23, 1999 for $170,000, according to the county's recorded deed.

How big is 12 Union St, Stonington, CT?

12 Union St, Stonington, CT has 2 bedrooms, 2 bathrooms, 881 square feet of living space and a 0.03-acre lot.

When was 12 Union St, Stonington, CT built?

12 Union St, Stonington, CT was built in 1774, making it 252 years old. It is a historical home. The building has 2 stories.

What schools serve 12 Union St, Stonington, CT?

12 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 12 Union St, Stonington, CT compare to other homes in Stonington 06378?

Among the 2,941 homes in Stonington 06378, it is worth more than 32% of them ($672,438 against a typical $847,213), its price per square foot is higher than 89% of them ($763 against a typical $422), it is bigger than 5% of them (881 ft² against a typical 1,862 ft²), its lot is bigger than almost none of them (1,307 ft² against a typical 0.93 ac) and it is newer than almost none of them (1774 against a typical 1970). Measured against all of Southeastern Connecticut County, it is worth more than 87% 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 12 Union St, Stonington, CT?

The 2025 property tax bill for 12 Union St, Stonington, CT was $6,268. The county assessed it at $308,100.

More homes on Union St

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