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Single Family ResidenceResidential
$627,674$473 / 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 94How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $420,000 on Jun 29, 2018

20 FLAGG RD

SOUTHBOROUGH, MA 01772
3
Beds
1.5
Baths
1,328 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.
1.02 ac
Lot SizeThe size of the land the home sits on, from county records.
1964
Year BuiltThe year the home was originally built, according to county records.
1
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.
1
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$628K
$593K low$663K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$420,000 · Jun 29, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,173 (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.$519,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$300,400
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$219,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$497,700
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$690,270

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.Ranch
CountyWORCESTER
Lot (acres)The size of the land the home sits on, from county records.1.02
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.Forced Air With Air Conditioning
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, Attached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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.

M
P Brent TrottierA-
Middle · Grades 6–8 · 0.5 mi
E
Mary E Finn School
Elementary · Grades PK–1 · 1.7 mi
H
Algonquin Regional High SchoolA
High · Grades 9–12 · 3.8 mi

District: Southborough School District

Neighborhood · ZIP 01772These 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.32
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 100.63

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.97%
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.3.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.5%
PopulationHow many people live in this area.10,867
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.705 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$180,666
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$225,158
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.48 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.50%

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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

20 Flagg 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.

  • Worth less than 87% of homes in Southborough 01772
  • Costs more per square foot than 97% of homes in Worcester County
  • Smaller than 87% of homes in Southborough 01772
  • Has a bigger lot than 69% of homes in Worcester County
  • Older than 74% of homes in Southborough 01772

What homes are worth in Southborough 01772

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

This home
$480K$2.1M

This home is worth more than 13% of homes in Southborough 01772.

How it measures up in Southborough 01772

The dot is this home. The mark in the middle is the typical home in Southborough 01772.

Estimated value$627,674
CheaperTypical $949,044Pricier

Pricier than 13% of homes nearby

Price per ft²$473
CheaperTypical $412Pricier

Pricier than 81% of homes nearby

Living area1,328 ft²
SmallerTypical 2,443 ft²Bigger

Bigger than 13% of homes nearby

Lot size1.02 ac
SmallerTypical 1 acBigger

Bigger than 56% of homes nearby

Year built1964
OlderTypical 1984Newer

Newer than 26% of homes nearby

How 20 Flagg Rd ranks against every home in each area.
MeasureThis homeSouthborough 01772Worcester County
Estimated valuepricier than$627,67413% of homes75% of homes
Price per ft²pricier than$47381% of homes97% of homes
Living areabigger than1,328 ft²13% of homes29% of homes
Lot sizebigger than1.02 ac56% of homes69% of homes
Year builtnewer than196426% of homes46% of homes

About 20 Flagg Rd

How much is 20 Flagg Rd, Southborough, MA worth?

The TopHap Estimate for 20 Flagg Rd, Southborough, MA is $627,674 as of Sep 24, 2026. The likely range is $592,682 to $662,666. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Flagg Rd, Southborough, MA last sell?

20 Flagg Rd, Southborough, MA last sold on Jun 29, 2018 for $420,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 20 Flagg Rd, Southborough, MA?

20 Flagg Rd, Southborough, MA has 3 bedrooms, 1.5 bathrooms, 1,328 square feet of living space and a 1.02-acre lot.

When was 20 Flagg Rd, Southborough, MA built?

20 Flagg Rd, Southborough, MA was built in 1964, making it 62 years old. It is a ranch home. The building has 1 story.

What schools serve 20 Flagg Rd, Southborough, MA?

20 Flagg Rd, Southborough, MA is assigned to P Brent Trottier (middle), rated A-; Mary E Finn School (elementary); Algonquin Regional High School (high), rated A. All sit in Southborough School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Flagg Rd, Southborough, MA compare to other homes in Southborough 01772?

Among the 3,253 homes in Southborough 01772, it is worth more than 13% of them ($627,674 against a typical $949,044), its price per square foot is higher than 81% of them ($473 against a typical $412), it is bigger than 13% of them (1,328 ft² against a typical 2,443 ft²), its lot is bigger than 56% of them (1.02 ac against a typical 1 ac) and it is newer than 26% of them (1964 against a typical 1984). Measured against all of Worcester County, it is worth more than 75% 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 20 Flagg Rd, Southborough, MA?

The 2025 property tax bill for 20 Flagg Rd, Southborough, MA was $7,173. The county assessed it at $519,400.

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