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Duplex (2 Units, Any Combination)Residential

309 PORTSMOUTH AVE

SEABROOK, NH 03874
6
Beds
2.5
Baths
2,288 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.
1960
Year BuiltThe year the home was originally built, according to county records.
1
StoriesHow many floors the home has above ground.
10
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$10,185 (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.$821,400 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$568,500
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$252,900

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.14 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.34%
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.Duplex (2 Units, Any Combination)
CountyROCKINGHAM
Lot (acres)The size of the land the home sits on, from county records.0.11
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
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Deck

Transaction History(1)

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
Seabrook Middle SchoolD
Middle · Grades 5–8 · 1.7 mi
E
Seabrook Elementary SchoolD+
Elementary · Grades PK–4 · 1.8 mi
H
Winnacunnet High SchoolB
High · Grades 9–12 · 2.8 mi

District: Winnacunnet Cooperative School District

Neighborhood · ZIP 03874These 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.142
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.89
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.95

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.84%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.17%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.6.7%
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.8,644
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.911 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$84,550
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$117,811
Average tempThe average temperature here across a full year.48°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.54%

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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

309 Portsmouth 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.

  • Bigger than 79% of homes in Seabrook 03874
  • Has a smaller lot than 91% of homes in Rockingham County
  • Older than 81% of homes in Seabrook 03874

How it measures up in Seabrook 03874

The dot is this home. The mark in the middle is the typical home in Seabrook 03874.

Living area2,288 ft²
SmallerTypical 1,566 ft²Bigger

Bigger than 79% of homes nearby

Lot size0.11 ac
SmallerTypical 0.35 acBigger

Bigger than 20% of homes nearby

Year built1960
OlderTypical 1989Newer

Newer than 19% of homes nearby

How 309 Portsmouth Ave ranks against every home in each area.
MeasureThis homeSeabrook 03874Rockingham County
Living areabigger than2,288 ft²79% of homes70% of homes
Lot sizebigger than0.11 ac20% of homes9% of homes
Year builtnewer than196019% of homes21% of homes

About 309 Portsmouth Ave

When did 309 Portsmouth Ave, Seabrook, NH last sell?

309 Portsmouth Ave, Seabrook, NH last sold on Jan 1, 1900, according to the county's recorded deed.

How big is 309 Portsmouth Ave, Seabrook, NH?

309 Portsmouth Ave, Seabrook, NH has 6 bedrooms, 2.5 bathrooms, 2,288 square feet of living space and a 0.11-acre lot.

When was 309 Portsmouth Ave, Seabrook, NH built?

309 Portsmouth Ave, Seabrook, NH was built in 1960, making it 66 years old. The building has 1 story.

What schools serve 309 Portsmouth Ave, Seabrook, NH?

309 Portsmouth Ave, Seabrook, NH is assigned to Seabrook Middle School (middle), rated D; Seabrook Elementary School (elementary), rated D+; Winnacunnet High School (high), rated B. All sit in Winnacunnet Cooperative School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 309 Portsmouth Ave, Seabrook, NH compare to other homes in Seabrook 03874?

Among the 3,676 homes in Seabrook 03874, it is bigger than 79% of them (2,288 ft² against a typical 1,566 ft²), its lot is bigger than 20% of them (0.11 ac against a typical 0.35 ac) and it is newer than 19% of them (1960 against a typical 1989). These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 309 Portsmouth Ave, Seabrook, NH?

The 2025 property tax bill for 309 Portsmouth Ave, Seabrook, NH was $10,185. The county assessed it at $821,400.

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