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Single Family ResidenceResidential
$576,837$424 / 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 92How 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

21 COLLEGE ST

HOPKINTON, MA 01748
4
Beds
1
Baths
1,360 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.
3.2 ac
Lot SizeThe size of the land the home sits on, from county records.
1850
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$577K
$531K low$622K high

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,692 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$545,500 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$340,800
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$204,700
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$520,200
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$559,015

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.74 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.3.20
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
FireplaceWhether the home has a fireplace, and what kind.Yes
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.

E
Marathon Elementary School
Elementary · Grades PK–1 · 1.4 mi
H
Hopkinton High SchoolA+
High · Grades 9–12 · 1.8 mi
M
Hopkinton Middle SchoolA+
Middle · Grades 6–8 · 1.8 mi

District: Hopkinton School District

Neighborhood · ZIP 01748These 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.36
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.97
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.66

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.96%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.37%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.4%
PopulationHow many people live in this area.19,208
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.687 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$189,861
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$255,819
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.58%

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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 College 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 less than 90% of homes in Hopkinton 01748
  • Smaller than 85% of homes in Hopkinton 01748
  • Has a bigger lot than 92% of homes in Middlesex County
  • Older than 98% of homes in Middlesex County

What homes are worth in Hopkinton 01748

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

This home
$438K$2.1M

This home is worth more than 10% of homes in Hopkinton 01748.

How it measures up in Hopkinton 01748

The dot is this home. The mark in the middle is the typical home in Hopkinton 01748.

Estimated value$576,837
CheaperTypical $969,950Pricier

Pricier than 10% of homes nearby

Price per ft²$424
CheaperTypical $424Pricier

Pricier than 50% of homes nearby

Living area1,360 ft²
SmallerTypical 2,322 ft²Bigger

Bigger than 15% of homes nearby

Lot size3.2 ac
SmallerTypical 1.24 acBigger

Bigger than 75% of homes nearby

Year built1850
OlderTypical 1992Newer

Newer than 3% of homes nearby

How 21 College St ranks against every home in each area.
MeasureThis homeHopkinton 01748Middlesex County
Estimated valuepricier than$576,83710% of homes23% of homes
Price per ft²pricier than$42450% of homes40% of homes
Living areabigger than1,360 ft²15% of homes28% of homes
Lot sizebigger than3.2 ac75% of homes92% of homes
Year builtnewer than18503% of homes2% of homes

About 21 College St

How much is 21 College St, Hopkinton, MA worth?

The TopHap Estimate for 21 College St, Hopkinton, MA is $576,837 as of Sep 24, 2026. The likely range is $531,447 to $622,227. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 College St, Hopkinton, MA last sell?

21 College St, Hopkinton, MA last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 21 College St, Hopkinton, MA?

21 College St, Hopkinton, MA has 4 bedrooms, 1 bathrooms, 1,360 square feet of living space and a 3.20-acre lot.

When was 21 College St, Hopkinton, MA built?

21 College St, Hopkinton, MA was built in 1850, making it 176 years old. The building has 2 stories.

What schools serve 21 College St, Hopkinton, MA?

21 College St, Hopkinton, MA is assigned to Marathon Elementary School (elementary); Hopkinton High School (high), rated A+; Hopkinton Middle School (middle), rated A+. All sit in Hopkinton School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 College St, Hopkinton, MA compare to other homes in Hopkinton 01748?

Among the 6,096 homes in Hopkinton 01748, it is worth more than 10% of them ($576,837 against a typical $969,950), its price per square foot is higher than 50% of them ($424 against a typical $424), it is bigger than 15% of them (1,360 ft² against a typical 2,322 ft²), its lot is bigger than 75% of them (3.2 ac against a typical 1.24 ac) and it is newer than 3% of them (1850 against a typical 1992). Measured against all of Middlesex County, it is worth more than 23% 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 College St, Hopkinton, MA?

The 2026 property tax bill for 21 College St, Hopkinton, MA was $7,692. The county assessed it at $545,500.

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