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Single Family ResidenceResidential
$398,788$238 / 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 92How 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 $215,000 on Apr 21, 2020

20 MAIN ST

ALTON, NH 03809
2
Beds
2.5
Baths
1,673 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.
0.39 ac
Lot SizeThe size of the land the home sits on, from county records.
1900
Year BuiltThe year the home was originally built, according to county records.
1
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

$399K
$367K low$431K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$215,000 · Apr 21, 2020

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,786 (2024)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$214,600 (2024)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$72,300
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$142,300

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.56 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%

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
CountyBELKNAP
Lot (acres)The size of the land the home sits on, from county records.0.39
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Radiant
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.No Garage
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.

E
Alton Central School (Elementary)C+
Elementary · Grades PK–8 · 0.4 mi
H
Prospect Mountain High SchoolC
High · Grades 9–12 · 1.0 mi

District: Prospect Mountain High School Joint Maintenance Agreement District

Neighborhood · ZIP 03809These 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.96
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.120

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.69%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.7%
PopulationHow many people live in this area.3,428
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.82 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$103,054
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$123,748
Average tempThe average temperature here across a full year.44°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

20 Main 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.

  • Worth less than 81% of homes in Alton 03809
  • Costs less per square foot than 82% of homes in Belknap County
  • Has a smaller lot than 91% of homes in Alton 03809
  • Older than 91% of homes in Belknap County

What homes are worth in Alton 03809

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

This home
$269K$3.6M

This home is worth more than 19% of homes in Alton 03809.

How it measures up in Alton 03809

The dot is this home. The mark in the middle is the typical home in Alton 03809.

Estimated value$398,788
CheaperTypical $526,595Pricier

Pricier than 19% of homes nearby

Price per ft²$238
CheaperTypical $257Pricier

Pricier than 37% of homes nearby

Living area1,673 ft²
SmallerTypical 1,969 ft²Bigger

Bigger than 39% of homes nearby

Lot size0.39 ac
SmallerTypical 2 acBigger

Bigger than 9% of homes nearby

Year built1900
OlderTypical 1990Newer

Newer than 10% of homes nearby

How 20 Main St ranks against every home in each area.
MeasureThis homeAlton 03809Belknap County
Estimated valuepricier than$398,78819% of homes26% of homes
Price per ft²pricier than$23837% of homes18% of homes
Living areabigger than1,673 ft²39% of homes57% of homes
Lot sizebigger than0.39 ac9% of homes28% of homes
Year builtnewer than190010% of homes9% of homes

About 20 Main St

How much is 20 Main St, Alton, NH worth?

The TopHap Estimate for 20 Main St, Alton, NH is $398,788 as of Aug 30, 2026. The likely range is $366,597 to $430,979. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 20 Main St, Alton, NH last sell?

20 Main St, Alton, NH last sold on Apr 21, 2020 for $215,000, according to the county's recorded deed. TopHap holds 2 recorded sales for this parcel.

How big is 20 Main St, Alton, NH?

20 Main St, Alton, NH has 2 bedrooms, 2.5 bathrooms, 1,673 square feet of living space and a 0.39-acre lot.

When was 20 Main St, Alton, NH built?

20 Main St, Alton, NH was built in 1900, making it 126 years old. It is a ranch home. The building has 1 story.

What schools serve 20 Main St, Alton, NH?

20 Main St, Alton, NH is assigned to Alton Central School (Elementary) (elementary), rated C+; Prospect Mountain High School (high), rated C. All sit in Prospect Mountain High School Joint Maintenance Agreement District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 20 Main St, Alton, NH compare to other homes in Alton 03809?

Among the 1,977 homes in Alton 03809, it is worth more than 19% of them ($398,788 against a typical $526,595), its price per square foot is higher than 37% of them ($238 against a typical $257), it is bigger than 39% of them (1,673 ft² against a typical 1,969 ft²), its lot is bigger than 9% of them (0.39 ac against a typical 2 ac) and it is newer than 10% of them (1900 against a typical 1990). Measured against all of Belknap County, it is worth more than 26% 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 20 Main St, Alton, NH?

The 2024 property tax bill for 20 Main St, Alton, NH was $2,786. The county assessed it at $214,600.

More homes on Main St

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Assigned schools

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