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Single Family ResidenceResidential
$679,045
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 93How 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 CONNOLLY RD

BILLERICA, MA 01821
0
Baths
0.75 ac
Lot SizeThe size of the land the home sits on, from county records.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$679K
$632K low$726K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,492 (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.$746,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$337,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$409,000
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$709,365

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.32 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.minimal

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
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.75
HeatingThe type of heating system in the home.Wood Furnace
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Basement
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.Deck

Transaction History(5)

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
Thomas DitsonC
Elementary · Grades KG–4 · 0.8 mi
M
Locke Middle SchoolB+
Middle · Grades 5–7 · 1.7 mi
H
Billerica Memorial High SchoolC
High · Grades 8–12 · 3.3 mi

District: Billerica School District

Neighborhood · ZIP 01821These 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.40
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.100
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.82

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.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.28%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.3.8%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.3%
PopulationHow many people live in this area.31,495
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,857 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$133,460
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$152,991
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.47 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%

Owner Tools

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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

21 Connolly Rd 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.

  • Has a bigger lot than 74% of homes in Billerica 01821

What homes are worth in Billerica 01821

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

This home
$276K$1.1M

This home is worth more than 48% of homes in Billerica 01821.

How it measures up in Billerica 01821

The dot is this home. The mark in the middle is the typical home in Billerica 01821.

Estimated value$679,045
CheaperTypical $686,611Pricier

Pricier than 48% of homes nearby

Lot size0.75 ac
SmallerTypical 0.57 acBigger

Bigger than 74% of homes nearby

How 21 Connolly Rd ranks against every home in each area.
MeasureThis homeBillerica 01821Middlesex County
Estimated valuepricier than$679,04548% of homes37% of homes
Lot sizebigger than0.75 ac74% of homes73% of homes

About 21 Connolly Rd

How much is 21 Connolly Rd, Billerica, MA worth?

The TopHap Estimate for 21 Connolly Rd, Billerica, MA is $679,045 as of Aug 30, 2026. The likely range is $631,868 to $726,222. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Connolly Rd, Billerica, MA last sell?

21 Connolly Rd, Billerica, MA last sold on Jan 1, 1900, according to the county's recorded deed.

What schools serve 21 Connolly Rd, Billerica, MA?

21 Connolly Rd, Billerica, MA is assigned to Thomas Ditson (elementary), rated C; Locke Middle School (middle), rated B+; Billerica Memorial High School (high), rated C. All sit in Billerica School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Connolly Rd, Billerica, MA compare to other homes in Billerica 01821?

Among the 10,003 homes in Billerica 01821, it is worth more than 48% of them ($679,045 against a typical $686,611) and its lot is bigger than 74% of them (0.75 ac against a typical 0.57 ac). Measured against all of Middlesex County, it is worth more than 37% 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 Connolly Rd, Billerica, MA?

The 2025 property tax bill for 21 Connolly Rd, Billerica, MA was $8,492. The county assessed it at $746,900.

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