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Single Family ResidenceResidential
$367,467$574 / 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 90How 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 $143,000 on May 31, 2024

21 MONUMENT AVE

ONSET, MA 02558
2
Beds
1
Baths
640 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.
2,563 ft²
Lot SizeThe size of the land the home sits on, from county records.
1991
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
3
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$367K
$331K low$404K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$143,000 · May 31, 2024

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,766 (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.$343,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$157,700
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$185,300

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.24 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.45%
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.1 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.Ranch
CountyPLYMOUTH
Lot (acres)The size of the land the home sits on, from county records.0.06
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
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.

H
Wareham High SchoolD
High · Grades 9–12 · 4.3 mi
M
Wareham Middle SchoolC-
Middle · Grades 5–8 · 4.5 mi
E
John W. Decas Elementary
Elementary · Grades KG–2 · 6.0 mi

District: Wareham School District

Neighborhood · ZIP 02558These 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.191
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.87
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.59

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.67%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.18%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.11%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.88
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,267 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$83,803
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$110,781
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.49 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.52%

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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 Monument Ave 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 94% of homes in Plymouth County
  • Costs more per square foot than 89% of homes in Plymouth County
  • Smaller than 98% of homes in Plymouth County
  • Among the smallest lots in Plymouth County
  • Newer than 90% of homes in Onset 02558

What homes are worth in Onset 02558

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

This home
$236K$1.3M

This home is worth more than 21% of homes in Onset 02558.

How it measures up in Onset 02558

The dot is this home. The mark in the middle is the typical home in Onset 02558.

Estimated value$367,467
CheaperTypical $435,091Pricier

Pricier than 21% of homes nearby

Price per ft²$574
CheaperTypical $419Pricier

Pricier than 87% of homes nearby

Living area640 ft²
SmallerTypical 1,125 ft²Bigger

Bigger than 8% of homes nearby

Lot size2,563 ft²
SmallerTypical 4,312 ft²Bigger

Bigger than 11% of homes nearby

Year built1991
OlderTypical 1930Newer

Newer than 90% of homes nearby

How 21 Monument Ave ranks against every home in each area.
MeasureThis homeOnset 02558Plymouth County
Estimated valuepricier than$367,46721% of homes6% of homes
Price per ft²pricier than$57487% of homes89% of homes
Living areabigger than640 ft²8% of homes2% of homes
Lot sizebigger than2,563 ft²11% of homesalmost no homes
Year builtnewer than199190% of homes75% of homes

About 21 Monument Ave

How much is 21 Monument Ave, Onset, MA worth?

The TopHap Estimate for 21 Monument Ave, Onset, MA is $367,467 as of Sep 24, 2026. The likely range is $331,044 to $403,890. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Monument Ave, Onset, MA last sell?

21 Monument Ave, Onset, MA last sold on May 31, 2024 for $143,000, according to the county's recorded deed. TopHap holds 3 recorded sales for this parcel.

How big is 21 Monument Ave, Onset, MA?

21 Monument Ave, Onset, MA has 2 bedrooms, 1 bathrooms, 640 square feet of living space and a 0.06-acre lot.

When was 21 Monument Ave, Onset, MA built?

21 Monument Ave, Onset, MA was built in 1991, making it 35 years old. It is a ranch home. The building has 1 story.

What schools serve 21 Monument Ave, Onset, MA?

21 Monument Ave, Onset, MA is assigned to Wareham High School (high), rated D; Wareham Middle School (middle), rated C-; John W. Decas Elementary (elementary). All sit in Wareham School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Monument Ave, Onset, MA compare to other homes in Onset 02558?

Among the 273 homes in Onset 02558, it is worth more than 21% of them ($367,467 against a typical $435,091), its price per square foot is higher than 87% of them ($574 against a typical $419), it is bigger than 8% of them (640 ft² against a typical 1,125 ft²), its lot is bigger than 11% of them (2,563 ft² against a typical 4,312 ft²) and it is newer than 90% of them (1991 against a typical 1930). Measured against all of Plymouth County, it is worth more than 6% 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 Monument Ave, Onset, MA?

The 2025 property tax bill for 21 Monument Ave, Onset, MA was $3,766. The county assessed it at $343,000.

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