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Duplex (2 Units, Any Combination)Residential
Last sold for $455,000 on Jan 7, 2016

9 CASTLE ST

WALTHAM, MA 02451
4
Beds
2.5
Baths
2,406 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.
0.11 ac
Lot SizeThe size of the land the home sits on, from county records.
1880
Year BuiltThe year the home was originally built, according to county records.
3
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

Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$455,000 · Jan 7, 2016

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$8,711 (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.$887,100 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$338,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$549,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyMIDDLESEX
Lot (acres)The size of the land the home sits on, from county records.0.12
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.Hot Water
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(7)

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
Thomas R Plympton Elementary SchoolC-
Elementary · Grades KG–5 · 0.2 mi
H
Waltham Sr High SchoolD+
High · Grades 9–12 · 1.2 mi
M
John F. Kennedy Middle SchoolB
Middle · Grades 6–8 · 1.3 mi

District: Waltham School District

Neighborhood · ZIP 02451These 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.84
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.105
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.76

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.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.7.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.2%
PopulationHow many people live in this area.16,966
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.3,036 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$126,384
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$156,140
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%

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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

9 Castle 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 76% of homes in Waltham 02451
  • Has a smaller lot than 85% of homes in Middlesex County
  • Older than 98% of homes in Waltham 02451

How it measures up in Waltham 02451

The dot is this home. The mark in the middle is the typical home in Waltham 02451.

Living area2,406 ft²
SmallerTypical 1,778 ft²Bigger

Bigger than 76% of homes nearby

Lot size0.11 ac
SmallerTypical 0.18 acBigger

Bigger than 24% of homes nearby

Year built1880
OlderTypical 1957Newer

Newer than 2% of homes nearby

How 9 Castle St ranks against every home in each area.
MeasureThis homeBank SquareWaltham 02451Middlesex County
Living areabigger than2,406 ft²66% of homes76% of homes71% of homes
Lot sizebigger than0.11 ac24% of homes24% of homes15% of homes
Year builtnewer than18808% of homes2% of homes5% of homes

About 9 Castle St

When did 9 Castle St, Waltham, MA last sell?

9 Castle St, Waltham, MA last sold on Jan 7, 2016 for $455,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 9 Castle St, Waltham, MA?

9 Castle St, Waltham, MA has 4 bedrooms, 2.5 bathrooms, 2,406 square feet of living space and a 0.12-acre lot.

When was 9 Castle St, Waltham, MA built?

9 Castle St, Waltham, MA was built in 1880, making it 146 years old. It is a duplex single home. The building has 3 stories.

What schools serve 9 Castle St, Waltham, MA?

9 Castle St, Waltham, MA is assigned to Thomas R Plympton Elementary School (elementary), rated C-; Waltham Sr High School (high), rated D+; John F. Kennedy Middle School (middle), rated B. All sit in Waltham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 9 Castle St, Waltham, MA compare to other homes in Waltham 02451?

Among the 4,967 homes in Waltham 02451, it is bigger than 76% of them (2,406 ft² against a typical 1,778 ft²), its lot is bigger than 24% of them (0.11 ac against a typical 0.18 ac) and it is newer than 2% of them (1880 against a typical 1957). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 9 Castle St, Waltham, MA?

The 2025 property tax bill for 9 Castle St, Waltham, MA was $8,711. The county assessed it at $887,100.

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