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Apartments (Generic)Residential
Last sold for $195,000 on Jun 11, 1987

20 UNION ST

CHARLESTOWN, MA 02129
4
Baths
2,247 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.
1,344 ft²
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.
3
StoriesHow many floors the home has above ground.

Valuation

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$195,000 · Jun 11, 1987

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$14,012 (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.$1,210,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$431,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$778,900

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Apartments (Generic)
CountySUFFOLK
Lot (acres)The size of the land the home sits on, from county records.0.03
ConstructionThe main material the home's frame and walls are built from.Brick
PoolWhether the property has a pool, and what kind, such as in-ground.No

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
Warren / Prescott K-8 SchoolA-
Elementary · Grades PK–8 · 0.3 mi
H
Horace Mann School For The Deaf
High · Grades PK–12 · 0.3 mi

District: Boston School District

Neighborhood · ZIP 02129These 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.89
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.73

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.35%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.8.3%
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.18,397
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.10,594 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$152,177
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$178,903
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.46 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

20 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.

  • Bigger than 86% of homes in Charlestown 02129
  • Has a bigger lot than 65% of homes in Charlestown 02129
  • Older than 69% of homes in Suffolk County

How it measures up in Charlestown 02129

The dot is this home. The mark in the middle is the typical home in Charlestown 02129.

Living area2,247 ft²
SmallerTypical 1,200 ft²Bigger

Bigger than 86% of homes nearby

Lot size1,344 ft²
SmallerTypical 1,133 ft²Bigger

Bigger than 65% of homes nearby

Year built1900
OlderTypical 1899Newer

Newer than 65% of homes nearby

How 20 Union St ranks against every home in each area.
MeasureThis homeCharlestown 02129Suffolk County
Living areabigger than2,247 ft²86% of homes72% of homes
Lot sizebigger than1,344 ft²65% of homes36% of homes
Year builtnewer than190065% of homes31% of homes

About 20 Union St

When did 20 Union St, Charlestown, MA last sell?

20 Union St, Charlestown, MA last sold on Jun 11, 1987 for $195,000, according to the county's recorded deed.

How big is 20 Union St, Charlestown, MA?

20 Union St, Charlestown, MA has 4 bathrooms, 2,247 square feet of living space and a 0.03-acre lot.

When was 20 Union St, Charlestown, MA built?

20 Union St, Charlestown, MA was built in 1900, making it 126 years old. The building has 3 stories.

What schools serve 20 Union St, Charlestown, MA?

20 Union St, Charlestown, MA is assigned to Warren / Prescott K-8 School (elementary), rated A-; Horace Mann School For The Deaf (high). All sit in Boston School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Union St, Charlestown, MA compare to other homes in Charlestown 02129?

Among the 5,260 homes in Charlestown 02129, it is bigger than 86% of them (2,247 ft² against a typical 1,200 ft²), its lot is bigger than 65% of them (1,344 ft² against a typical 1,133 ft²) and it is newer than 65% of them (1900 against a typical 1899). 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 Union St, Charlestown, MA?

The 2025 property tax bill for 20 Union St, Charlestown, MA was $14,012. The county assessed it at $1,210,000.

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