Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$1,252,855
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 92How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Oct 21, 2026

266 COMMONWEALTH AVE

CONCORD, MA 01742
0
Baths
0.52 ac
Lot SizeThe size of the land the home sits on, from county records.

Valuation

$1.3M
$1.1M low$1.4M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$17,104 (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.$1,289,900 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$505,200
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$784,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,260,200

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.10 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.6%
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.0.52
HeatingThe type of heating system in the home.None
PoolWhether the property has a pool, and what kind, such as in-ground.In-Ground Pool

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
Thoreau Elementary SchoolA+
Elementary · Grades KG–5 · 0.7 mi
M
Concord Middle SchoolA+
Middle · Grades 6–8 · 1.5 mi
H
Concord Carlisle High SchoolA+
High · Grades 9–12 · 2.7 mi

District: Concord School District

Neighborhood · ZIP 01742These 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.47
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.108
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.74

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.94%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.30%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.2.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.18,974
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.737 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$185,796
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$221,000
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

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

266 Commonwealth 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 more than 82% of homes in Middlesex County
  • Has a bigger lot than 65% of homes in Middlesex County

What homes are worth in Concord 01742

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

This home
$519K$4.5M

This home is worth more than 37% of homes in Concord 01742.

How it measures up in Concord 01742

The dot is this home. The mark in the middle is the typical home in Concord 01742.

Estimated value$1,252,855
CheaperTypical $1,459,463Pricier

Pricier than 37% of homes nearby

Lot size0.52 ac
SmallerTypical 0.59 acBigger

Bigger than 44% of homes nearby

How 266 Commonwealth Ave ranks against every home in each area.
MeasureThis homeConcord 01742Middlesex County
Estimated valuepricier than$1,252,85537% of homes82% of homes
Lot sizebigger than0.52 ac44% of homes65% of homes

About 266 Commonwealth Ave

How much is 266 Commonwealth Ave, Concord, MA worth?

The TopHap Estimate for 266 Commonwealth Ave, Concord, MA is $1,252,855 as of Oct 21, 2026. The likely range is $1,148,197 to $1,357,513. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

What schools serve 266 Commonwealth Ave, Concord, MA?

266 Commonwealth Ave, Concord, MA is assigned to Thoreau Elementary School (elementary), rated A+; Concord Middle School (middle), rated A+; Concord Carlisle High School (high), rated A+. All sit in Concord School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 266 Commonwealth Ave, Concord, MA compare to other homes in Concord 01742?

Among the 5,735 homes in Concord 01742, it is worth more than 37% of them ($1,252,855 against a typical $1,459,463) and its lot is bigger than 44% of them (0.52 ac against a typical 0.59 ac). Measured against all of Middlesex County, it is worth more than 82% 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 266 Commonwealth Ave, Concord, MA?

The 2025 property tax bill for 266 Commonwealth Ave, Concord, MA was $17,104. The county assessed it at $1,289,900.

More homes on Commonwealth Ave

Closest homes

More homes in Concord 01742

Assigned schools

Explore the area

See this home in context

Open 266 Commonwealth 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