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Single Family ResidenceResidential
$664,503$270 / 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
Last sold for $144,900 on Oct 18, 1996

166 UNION ST

ASHLAND, MA 01721
4
Beds
2.5
Baths
2,458 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.
0.26 ac
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
9
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$665K
$609K low$720K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$144,900 · Oct 18, 1996

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,675 (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.$601,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$215,900
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$385,100
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$700,055

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.84 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.0.2 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.Colonial
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.1988
Lot (acres)The size of the land the home sits on, from county records.0.26
ConstructionThe main material the home's frame and walls are built from.Stone
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Steam
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, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(4)

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
Ashland High SchoolA
High · Grades 9–12 · 0.7 mi
M
Ashland Middle SchoolA
Middle · Grades 6–8 · 1.0 mi
E
Henry E Warren Elementary School
Elementary · Grades KG–2 · 1.3 mi

District: Ashland School District

Neighborhood · ZIP 01721These 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.99
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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.1%
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.18,969
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,481 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$135,702
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$157,800
Average tempThe average temperature here across a full year.49°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

166 Union 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 65% of homes in Middlesex County
  • Among the lowest price per square foot in Ashland 01721
  • Bigger than 82% of homes in Ashland 01721
  • Has a smaller lot than 92% of homes in Ashland 01721
  • Older than 97% of homes in Ashland 01721

What homes are worth in Ashland 01721

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

This home
$429K$1.3M

This home is worth more than 44% of homes in Ashland 01721.

How it measures up in Ashland 01721

The dot is this home. The mark in the middle is the typical home in Ashland 01721.

Estimated value$664,503
CheaperTypical $686,823Pricier

Pricier than 44% of homes nearby

Price per ft²$270
CheaperTypical $403Pricier

Cheaper than almost all homes nearby

Living area2,458 ft²
SmallerTypical 1,800 ft²Bigger

Bigger than 82% of homes nearby

Lot size0.26 ac
SmallerTypical 0.73 acBigger

Bigger than 8% of homes nearby

Year built1900
OlderTypical 1984Newer

Newer than 3% of homes nearby

How 166 Union St ranks against every home in each area.
MeasureThis homeAshland 01721Middlesex County
Estimated valuepricier than$664,50344% of homes35% of homes
Price per ft²pricier than$270almost no homes5% of homes
Living areabigger than2,458 ft²82% of homes73% of homes
Lot sizebigger than0.26 ac8% of homes45% of homes
Year builtnewer than19003% of homes16% of homes

About 166 Union St

How much is 166 Union St, Ashland, MA worth?

The TopHap Estimate for 166 Union St, Ashland, MA is $664,503 as of Sep 24, 2026. The likely range is $609,477 to $719,529. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 166 Union St, Ashland, MA last sell?

166 Union St, Ashland, MA last sold on Oct 18, 1996 for $144,900, according to the county's recorded deed.

How big is 166 Union St, Ashland, MA?

166 Union St, Ashland, MA has 4 bedrooms, 2.5 bathrooms, 2,458 square feet of living space and a 0.26-acre lot.

When was 166 Union St, Ashland, MA built?

166 Union St, Ashland, MA was built in 1900, making it 126 years old. It is a colonial home. The building has 2 stories.

What schools serve 166 Union St, Ashland, MA?

166 Union St, Ashland, MA is assigned to Ashland High School (high), rated A; Ashland Middle School (middle), rated A; Henry E Warren Elementary School (elementary). All sit in Ashland School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 166 Union St, Ashland, MA compare to other homes in Ashland 01721?

Among the 6,092 homes in Ashland 01721, it is worth more than 44% of them ($664,503 against a typical $686,823), its price per square foot is higher than almost none of them ($270 against a typical $403), it is bigger than 82% of them (2,458 ft² against a typical 1,800 ft²), its lot is bigger than 8% of them (0.26 ac against a typical 0.73 ac) and it is newer than 3% of them (1900 against a typical 1984). Measured against all of Middlesex County, it is worth more than 35% 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 166 Union St, Ashland, MA?

The 2025 property tax bill for 166 Union St, Ashland, MA was $7,675. The county assessed it at $601,000.

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