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Single Family ResidenceResidential
$531,573$422 / 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 89How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $525,000 on Apr 8, 2025

171 DIAMOND AVE

GREAT DIAMOND ISLAND, ME 04109
2
Beds
2
Baths
1,260 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.
897 ft²
Lot SizeThe size of the land the home sits on, from county records.
1860
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
4
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Valuation

$532K
$472K low$591K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$525,000 · Apr 8, 2025

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$5,433 (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.$453,500 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$115,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$338,000
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$380,400

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.Colonial
CountyCUMBERLAND
Lot (acres)The size of the land the home sits on, from county records.0.02
HeatingThe type of heating system in the home.Electric
CoolingThe type of cooling or air conditioning in the home.Yes
FireplaceWhether the home has a fireplace, and what kind.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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
Portland High SchoolC-
High · Grades 9–12 · 3.5 mi
E
Howard C Reiche Community SchoolD+
Elementary · Grades PK–5 · 4.2 mi
M
King Middle SchoolD-
Middle · Grades 6–8 · 4.3 mi

District: Portland

Neighborhood · ZIP 04109These 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.197
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.94
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.84

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.25%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.56%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.12%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.8%
PopulationHow many people live in this area.2
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.19 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$25,000
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$111,999
Average tempThe average temperature here across a full year.46°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.57%

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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

171 Diamond 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 79% of homes in Portland 04109
  • Smaller than 83% of homes in Portland 04109
  • Among the smallest lots in Cumberland County
  • Older than 97% of homes in Cumberland County

What homes are worth in Portland 04109

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

This home
$337K$2.2M

This home is worth more than 21% of homes in Portland 04109.

How it measures up in Portland 04109

The dot is this home. The mark in the middle is the typical home in Portland 04109.

Estimated value$531,573
CheaperTypical $825,037Pricier

Pricier than 21% of homes nearby

Price per ft²$422
CheaperTypical $426Pricier

Pricier than 49% of homes nearby

Living area1,260 ft²
SmallerTypical 1,885 ft²Bigger

Bigger than 17% of homes nearby

Lot size897 ft²
SmallerTypical 0.41 acBigger

Bigger than 14% of homes nearby

Year built1860
OlderTypical 1900Newer

Newer than 25% of homes nearby

How 171 Diamond Ave ranks against every home in each area.
MeasureThis homePortland 04109Cumberland County
Estimated valuepricier than$531,57321% of homes43% of homes
Price per ft²pricier than$42249% of homes60% of homes
Living areabigger than1,260 ft²17% of homes35% of homes
Lot sizebigger than897 ft²14% of homesalmost no homes
Year builtnewer than186025% of homes3% of homes

About 171 Diamond Ave

How much is 171 Diamond Ave, Great Diamond Island, ME worth?

The TopHap Estimate for 171 Diamond Ave, Great Diamond Island, ME is $531,573 as of Aug 30, 2026. The likely range is $471,899 to $591,247. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 171 Diamond Ave, Great Diamond Island, ME last sell?

171 Diamond Ave, Great Diamond Island, ME last sold on Apr 8, 2025 for $525,000, according to the county's recorded deed.

How big is 171 Diamond Ave, Great Diamond Island, ME?

171 Diamond Ave, Great Diamond Island, ME has 2 bedrooms, 2 bathrooms, 1,260 square feet of living space and a 0.02-acre lot.

When was 171 Diamond Ave, Great Diamond Island, ME built?

171 Diamond Ave, Great Diamond Island, ME was built in 1860, making it 166 years old. It is a colonial home. The building has 2 stories.

What schools serve 171 Diamond Ave, Great Diamond Island, ME?

171 Diamond Ave, Great Diamond Island, ME is assigned to Portland High School (high), rated C-; Howard C Reiche Community School (elementary), rated D+; King Middle School (middle), rated D-. All sit in Portland. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 171 Diamond Ave, Great Diamond Island, ME compare to other homes in Portland 04109?

Among the 214 homes in Portland 04109, it is worth more than 21% of them ($531,573 against a typical $825,037), its price per square foot is higher than 49% of them ($422 against a typical $426), it is bigger than 17% of them (1,260 ft² against a typical 1,885 ft²), its lot is bigger than 14% of them (897 ft² against a typical 0.41 ac) and it is newer than 25% of them (1860 against a typical 1900). Measured against all of Cumberland County, it is worth more than 43% 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 171 Diamond Ave, Great Diamond Island, ME?

The 2025 property tax bill for 171 Diamond Ave, Great Diamond Island, ME was $5,433. The county assessed it at $453,500.

More homes on Diamond Ave

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More homes in Great Diamond Island 04109

Assigned schools

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