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Single Family ResidenceResidential
$475,221$440 / 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 96How 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 $115,000 on Mar 29, 1999

21 MARTENS RD

PORTSMOUTH, RI 02871
3
Beds
1
Baths
1,080 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.
0.23 ac
Lot SizeThe size of the land the home sits on, from county records.
1950
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
5
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$475K
$458K low$492K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$115,000 · Mar 29, 1999

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$4,608 (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.$347,000 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$203,600
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$143,400

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
CountyNEWPORT
Lot (acres)The size of the land the home sits on, from county records.0.23
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(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.

M
Portsmouth Middle SchoolA-
Middle · Grades 5–8 · 2.2 mi
H
Portsmouth High SchoolA+
High · Grades 9–12 · 2.6 mi
E
Hathaway Elementary SchoolA
Elementary · Grades KG–4 · 2.9 mi

District: Portsmouth School District

Neighborhood · ZIP 02871These 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.101
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.60

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.89%
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.5.0%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.16,919
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.620 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$115,631
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$147,136
Average tempThe average temperature here across a full year.50°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 Martens Rd 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 86% of homes in Newport County
  • Smaller than 81% of homes in Newport County
  • Has a smaller lot than 71% of homes in Portsmouth 02871
  • Older than 80% of homes in Portsmouth 02871

What homes are worth in Portsmouth 02871

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

This home
$254K$2.4M

This home is worth more than 15% of homes in Portsmouth 02871.

How it measures up in Portsmouth 02871

The dot is this home. The mark in the middle is the typical home in Portsmouth 02871.

Estimated value$475,221
CheaperTypical $715,322Pricier

Pricier than 15% of homes nearby

Price per ft²$440
CheaperTypical $443Pricier

Pricier than 49% of homes nearby

Living area1,080 ft²
SmallerTypical 1,620 ft²Bigger

Bigger than 20% of homes nearby

Lot size0.23 ac
SmallerTypical 0.41 acBigger

Bigger than 29% of homes nearby

Year built1950
OlderTypical 1976Newer

Newer than 20% of homes nearby

How 21 Martens Rd ranks against every home in each area.
MeasureThis homePortsmouth 02871Newport County
Estimated valuepricier than$475,22115% of homes14% of homes
Price per ft²pricier than$44049% of homes36% of homes
Living areabigger than1,080 ft²20% of homes19% of homes
Lot sizebigger than0.23 ac29% of homes39% of homes
Year builtnewer than195020% of homes34% of homes

About 21 Martens Rd

How much is 21 Martens Rd, Portsmouth, RI worth?

The TopHap Estimate for 21 Martens Rd, Portsmouth, RI is $475,221 as of Sep 24, 2026. The likely range is $458,211 to $492,231. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 21 Martens Rd, Portsmouth, RI last sell?

21 Martens Rd, Portsmouth, RI last sold on Mar 29, 1999 for $115,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 21 Martens Rd, Portsmouth, RI?

21 Martens Rd, Portsmouth, RI has 3 bedrooms, 1 bathrooms, 1,080 square feet of living space and a 0.23-acre lot.

When was 21 Martens Rd, Portsmouth, RI built?

21 Martens Rd, Portsmouth, RI was built in 1950, making it 76 years old. It is a ranch home. The building has 1 story.

What schools serve 21 Martens Rd, Portsmouth, RI?

21 Martens Rd, Portsmouth, RI is assigned to Portsmouth Middle School (middle), rated A-; Portsmouth High School (high), rated A+; Hathaway Elementary School (elementary), rated A. All sit in Portsmouth School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 21 Martens Rd, Portsmouth, RI compare to other homes in Portsmouth 02871?

Among the 7,733 homes in Portsmouth 02871, it is worth more than 15% of them ($475,221 against a typical $715,322), its price per square foot is higher than 49% of them ($440 against a typical $443), it is bigger than 20% of them (1,080 ft² against a typical 1,620 ft²), its lot is bigger than 29% of them (0.23 ac against a typical 0.41 ac) and it is newer than 20% of them (1950 against a typical 1976). Measured against all of Newport County, it is worth more than 14% 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 Martens Rd, Portsmouth, RI?

The 2025 property tax bill for 21 Martens Rd, Portsmouth, RI was $4,608. The county assessed it at $347,000.

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