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Single Family ResidenceResidential
$1,656,456$672 / 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 89How 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

646 MAIN ST

CONCORD, MA 01742
4
Beds
4 / 1
Baths
2,464 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.
0.53 ac
Lot SizeThe size of the land the home sits on, from county records.
1963
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$1.7M
$1.5M low$1.8M high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$19,814 (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.$1,494,300 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$978,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$516,200
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$1,473,300

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.15 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.51%
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.Contemporary
CountyMiddlesex
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1965
Lot (acres)The size of the land the home sits on, from county records.0.53
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
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

Transaction History(6)

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.

H
Concord Carlisle High SchoolA+
High · Grades 9–12 · 1.4 mi
M
Concord Middle SchoolB+
Middle · Grades 6–8 · 1.7 mi
E
Willard Elementary SchoolA-
Elementary · Grades KG–5 · 2.0 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

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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

646 Main 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 91% of homes in Middlesex County
  • Costs more per square foot than 84% of homes in Middlesex County
  • Bigger than 73% of homes in Middlesex County
  • Has a bigger lot than 66% 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
$553K$4.3M

This home is worth more than 61% 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$1,656,456
CheaperTypical $1,449,921Pricier

Pricier than 61% of homes nearby

Price per ft²$672
CheaperTypical $601Pricier

Pricier than 69% of homes nearby

Living area2,464 ft²
SmallerTypical 2,386 ft²Bigger

Bigger than 53% of homes nearby

Lot size0.53 ac
SmallerTypical 0.67 acBigger

Bigger than 42% of homes nearby

Year built1963
OlderTypical 1966Newer

Newer than 46% of homes nearby

How 646 Main St ranks against every home in each area.
MeasureThis homeConcord 01742Middlesex County
Estimated valuepricier than$1,656,45661% of homes91% of homes
Price per ft²pricier than$67269% of homes84% of homes
Living areabigger than2,464 ft²53% of homes73% of homes
Lot sizebigger than0.53 ac42% of homes66% of homes
Year builtnewer than196346% of homes56% of homes

About 646 Main St

How much is 646 Main St, Concord, MA worth?

The TopHap Estimate for 646 Main St, Concord, MA is $1,656,456 as of Aug 30, 2026. The likely range is $1,471,075 to $1,841,837. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

How big is 646 Main St, Concord, MA?

646 Main St, Concord, MA has 4 bedrooms, 4 bathrooms, 2,464 square feet of living space and a 0.53-acre lot.

When was 646 Main St, Concord, MA built?

646 Main St, Concord, MA was built in 1963, making it 63 years old. It is a contemporary home. The building has 2 stories.

What schools serve 646 Main St, Concord, MA?

646 Main St, Concord, MA is assigned to Concord Carlisle High School (high), rated A+; Concord Middle School (middle), rated B+; Willard Elementary School (elementary), rated A-. All sit in Concord School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 646 Main St, Concord, MA compare to other homes in Concord 01742?

Among the 5,735 homes in Concord 01742, it is worth more than 61% of them ($1,656,456 against a typical $1,449,921), its price per square foot is higher than 69% of them ($672 against a typical $601), it is bigger than 53% of them (2,464 ft² against a typical 2,386 ft²), its lot is bigger than 42% of them (0.53 ac against a typical 0.67 ac) and it is newer than 46% of them (1963 against a typical 1966). Measured against all of Middlesex County, it is worth more than 91% 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 646 Main St, Concord, MA?

The 2025 property tax bill for 646 Main St, Concord, MA was $19,814. The county assessed it at $1,494,300.

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