Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$329,744$204 / 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 95How 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

21 ROCK AVE

DANIELSON, CT 06239
4
Beds
3.5
Baths
1,620 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 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
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

$330K
$312K low$348K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,004 (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.$213,410 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$36,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$177,010
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$213,410
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$149,387

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.54
78
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
11
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
55
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
95
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
32
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.63 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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
StyleThe architectural style of the home, such as ranch or colonial.Cape Cod
CountyNORTHEASTERN CONNECTICUT
Lot (acres)The size of the land the home sits on, from county records.1.00
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.SaunaElevator

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
Killingly Central School
Elementary · Grades PK–1 · 1.4 mi
M
Killingly Intermediate SchoolC-
Middle · Grades 5–8 · 1.8 mi
H
Killingly High SchoolC-
High · Grades 9–12 · 2.1 mi

District: Killingly School District

Neighborhood · ZIP 06239These 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.97
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.117
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.58

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.19%
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.11,304
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.506 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$85,119
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$90,154
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.51 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.56%

Owner Tools

Do you own this home?
Claim this home

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

21 Rock 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.

  • Worth less than 71% of homes in Northeastern Connecticut County
  • Costs less per square foot than 86% of homes in Danielson 06239
  • Bigger than 67% of homes in Danielson 06239
  • Has a bigger lot than 67% of homes in Danielson 06239
  • Older than 76% of homes in Northeastern Connecticut County

What homes are worth in Danielson 06239

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

This home
$213K$631K

This home is worth more than 36% of homes in Danielson 06239.

How it measures up in Danielson 06239

The dot is this home. The mark in the middle is the typical home in Danielson 06239.

Estimated value$329,744
CheaperTypical $357,824Pricier

Pricier than 36% of homes nearby

Price per ft²$204
CheaperTypical $272Pricier

Pricier than 14% of homes nearby

Living area1,620 ft²
SmallerTypical 1,354 ft²Bigger

Bigger than 67% of homes nearby

Lot size1 ac
SmallerTypical 0.58 acBigger

Bigger than 67% of homes nearby

Year built1950
OlderTypical 1969Newer

Newer than 28% of homes nearby

How 21 Rock Ave ranks against every home in each area.
MeasureThis homeDanielson 06239Northeastern Connecticut County
Estimated valuepricier than$329,74436% of homes29% of homes
Price per ft²pricier than$20414% of homes18% of homes
Living areabigger than1,620 ft²67% of homes57% of homes
Lot sizebigger than1 ac67% of homes42% of homes
Year builtnewer than195028% of homes24% of homes

About 21 Rock Ave

How much is 21 Rock Ave, Danielson, CT worth?

The TopHap Estimate for 21 Rock Ave, Danielson, CT is $329,744 as of Aug 30, 2026. The likely range is $311,739 to $347,749. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Rock Ave, Danielson, CT last sell?

21 Rock Ave, Danielson, CT last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 Rock Ave, Danielson, CT?

21 Rock Ave, Danielson, CT has 4 bedrooms, 3.5 bathrooms, 1,620 square feet of living space and a 1.00-acre lot.

When was 21 Rock Ave, Danielson, CT built?

21 Rock Ave, Danielson, CT was built in 1950, making it 76 years old. It is a cape cod home. The building has 1 story.

What schools serve 21 Rock Ave, Danielson, CT?

21 Rock Ave, Danielson, CT is assigned to Killingly Central School (elementary); Killingly Intermediate School (middle), rated C-; Killingly High School (high), rated C-. All sit in Killingly School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Rock Ave, Danielson, CT compare to other homes in Danielson 06239?

Among the 3,539 homes in Danielson 06239, it is worth more than 36% of them ($329,744 against a typical $357,824), its price per square foot is higher than 14% of them ($204 against a typical $272), it is bigger than 67% of them (1,620 ft² against a typical 1,354 ft²), its lot is bigger than 67% of them (1 ac against a typical 0.58 ac) and it is newer than 28% of them (1950 against a typical 1969). Measured against all of Northeastern Connecticut County, it is worth more than 29% 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 21 Rock Ave, Danielson, CT?

The 2025 property tax bill for 21 Rock Ave, Danielson, CT was $5,004. The county assessed it at $213,410.

More homes on Rock Ave

Closest homes

More homes in Danielson 06239

Assigned schools

Explore the area

See this home in context

Open 21 Rock Ave on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map